Risky Lifestyle Behaviors among Gastric Cancer Survivors Compared with Matched Non-cancer Controls: Results from Baseline Result of Community Based Cohort Study

Minkyung Kim; Kui Son Choi; Mina Suh; Jae Kwan Jun; Kumban Walter Chuck; Boyoung Park

doi:10.4143/crt.2017.129

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Original Article Risky Lifestyle Behaviors among Gastric Cancer Survivors Compared with Matched Non-cancer Controls: Results from Baseline Result of Community Based Cohort Study: Minkyung Kim, PharmD, MS¹, Kui Son Choi, PhD^1,2, Mina Suh, MD, PhD², Jae Kwan Jun, MD, PhD^1,2, Kumban Walter Chuck, MPH¹, Boyoung Park, MD, PhD^1,2,; Cancer Research and Treatment : Official Journal of Korean Cancer Association 2018;50(3):738-747.
DOI: https://doi.org/10.4143/crt.2017.129
Published online: July 24, 2017

¹Department of Cancer Control and Population Health, National Cancer Center Graduate School of Cancer Science and Policy, Goyang, Korea

²National Cancer Control Institute, National Cancer Center, Goyang, Korea

Correspondence: Boyoung Park, MD, PhD Department of Cancer Control and Population Health, National Cancer Center Graduate School of Cancer Science and Policy, 323 Ilsan-ro, Ilsandong-gu, Goyang 10408, Korea
Tel: 82-31-920-2914 Fax: 82-31-920-2759 E-mail: hayejine@ncc.re.kr

• Received: March 12, 2017 • Accepted: July 11, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Purpose
This study investigated the prevalence of smoking, drinking, and physical inactivity and the associated factors of these behaviors in gastric cancer survivors.
Materials and Methods
The baseline data from the nationwide cohort study was used. Four hundred thirty-seven gastric cancer survivors who survived ≥ 2 years from diagnosis and reported completion of treatment were matched with 4,370 controls according to age, sex, education, and household income.
Results
The prevalence rates of current smoking and drinking among gastric cancer survivors were 8.7% and 38.3%, which were significantly lower than those among matched controls (p ≤ 0.001), but the prevalence rates of physical inactivity were not significantly different (55.8% vs. 59.9%, p=0.248). In gastric cancer survivors, ≥ 5 years since cancer diagnosis and current drinking contributed to more current smoking; otherwise, age increment and femalewere associatedwith lower current smoking. Thosewith household income ≥ $2,000 and current smokers were more likely to drink and female showed less drinking. Female, currently employed state, and self-rated health status were associated with more physical inactivity.
Conclusion
Although gastric cancer survivors showed better health behaviors than controls, suggesting that the diagnosis of cancer may motivate individuals towards healthy behaviors, their current prevalence rates of smoking and drinking were still high, and more than 50% of them were physically inactive. Tailored interventions to improve their health behaviors considering associated factors for the gastric cancer survivors are necessary.
Key words: Stomach neoplasms, Survivors, Health behavior, Cross-sectional studies

Introduction

The number of cancer survivors worldwide has increased as the survival rate after a cancer diagnosis has improved [1]. In 2012, there were 32.6 million cancer survivors after being diagnosed with cancer for 5 years or more worldwide [1,2]. Cancer survivors are living in a burden of cancer [3]; thus, prevention of the possible secondary effects from cancer and related cancer burden should be considered. Several studies noted that health behaviors such as smoking, drinking, and physical inactivity patterns of cancer survivors are intimately linked with increased risk of morbidity [3,4]; thus, identification and modification of health behaviors in cancer survivors should be considered.

The incidence of gastric cancer in Eastern Asia is comparatively higher than that of in Western countries [5], which is ranked second for the cancer incidence and third for the 5-year prevalence among other cancer types [1]. It is reported that not only the incidence but also the prevalence of gastric cancer in Eastern Asia are one of the highest in the world [1,5,6]. These findings indicate that health behavior and associated sociodemographic factors with them in gastric cancer survivors are one of the most important issues in cancer survivor management. Although researchers’ attention has been devoted to evaluating health behavior patterns of cancer survivors in Western countries [7-9], the majority of findings were not focused on gastric cancer which is relatively uncommon in these regions [1].

Thus, this study investigated the prevalence of smoking, alcohol drinking, and physical inactivity in gastric cancer survivors compared to non-cancer controls and the associated sociodemographic factors with aforementioned health-related characteristics, using population based data in Korea where gastric cancer incidence is one of the highest worldwide [5].

Materials and Methods

1. Study population

Baseline data from Health Examinees (HEXA) study, which is a part of the nationwide cohort study, the Korea Genome Epidemiology Study (KoGES) was applied. A total of 167,169 subjects aged 40-79, who gave written consent forms, were collected from 38 community-based health examination centers located in eight regions in Korea by face to face interviews using an established questionnaire between 2004 and 2013. The composition of the questionnaire included socio-demographic factors, past medical history, family history, smoking and alcohol drinking, physical activity, dietary habits, socio-psychological factors, and reproductive factors. In addition, their physical examination and clinical lab tests results were collected. Details of the HEXA study are described elsewhere [10].

2. Case and control selection

There were 758 self-declared participants who had been diagnosed with gastric cancer on the questionnaire. Considering that the acute survival takes place after the first year treatment [11], we selected gastric cancer patients who survived ≥ 2 years from the diagnosis and reported that they completed treatment. Thus, 437 gastric cancer survivors (232 male and 205 female survivors) were included. Their mean age was 58 years old, including 36.8% of 2 to 5 years since diagnosis and 62.0% of ≥ 6 years since diagnosis. The participants without history of any types of cancer were randomly selected 1:10 ratio by frequency matching with gastric cancer survivors according to sex, 5-year age group, education level (< high school or ≥ high school in male and < middle school, middle school, or ≥ high school in female), and household income (< $2,000, $2,000 to < $4,000, or ≥ $4,000 per month in male and < $1,500, $1,500 to < $3,000, or ≥ $3,000 in female considering different education and income level according to sex). Thus, 437 gastric cancer survivors and 4,370 matched controls were included in the study.

3. Variables

The outcomes of this study included current smoking, current drinking, and physical activity status in gastric cancer survivors, compared with matched control group. Current smokers were defined as follows: those who reported ≥ 100 life time cigarettes and smoked at the time of surveying. In addition, those who had smoked ≥ 100 lifetime cigarettes but did not smoke at the time of the survey were classified as past smokers. Those who reported to have current drinking habit were defined as current drinkers and those who reported to have past drinking habit but quit drinking were defined as past drinkers. The drinking habit included any types of alcohol consumption. Those who reported performing moderate to vigorous activity < 150 minutes per week were classified as physically inactive and those who reported performing moderate to vigorous activity ≥ 150 minutes per week were defined as physically active following previous guidelines for cancer survivors [12].

To identify the associated factors with these health behaviors in gastric cancer survivors, age, sex, marital status, education attainment, household income, employment state, self-rated health status, family history of cancer, years since diagnosis, body mass index (BMI), and comorbid chronic disease were considered. The comorbid chronic disease was defined as any of the following diseases: hypertension, diabetes, dyslipidemia, stroke, transient ischemic attacks, angina or myocardial infarction, colon polyp, fatty liver, chronic liver disease or liver cirrhosis, gallbladder stone or cholecystitis, thyroid disease, arthritis, and osteoporosis.

4. Statistical analysis

The distribution of health behaviors including current smoking and drinking, physical inactivity, and baseline sociodemographic characteristics between gastric cancer survivors and matched controls were compared by a chi-square test. Among the gastric cancer survivors, the associations the associated factors with each risky health behavior—current smoking, current drinking, current physical activity status—were assessed using multivariate logistic regression and the results were presented as odds ratio (OR) and 95% confidence intervals (CIs). Statistical results were analyzed using SAS ver. 9.3 software (SAS Institute Inc., Cary, NC).

5. Ethical statement

The Institutional Review Board of the National Cancer Center approved this study protocol, which was in compliance with the Declaration of Helsinki (IRB No. NCC2014-0098). All participants provided their written informed consent.

Results

The comparison of baseline sociodemographic characteristics between 437 gastric cancer survivors and matched 4,370 controls are presented in Table 1. The distributions of matched variables (sex, age, educational attainment, and household income) and the proportion of subjects with comorbidity were similar between the two groups. However, current employment state was lower in gastric cancer survivors and self-rated health status, family history of cancer, and BMI were significantly different between the two groups (p < 0.05).

The prevalence of current smoking and current drinking in gastric cancer survivors were 8.7% and 38.3%, respectively, which were significantly lower than matched cancer free controls (15.4% and 49.7%, respectively; p=0.001 and p < 0.001); otherwise the prevalence of physical inactivity was not significantly different in two groups (55.8% and 59.9%; p=0.095) (Fig. 1A). The differences in smoking and drinking status were significant in male (p < 0.001) (Fig. 1B); however, in female, we did not find significant differences in these three health behaviors (Fig. 1C). Among the non-current smokers and drinkers, the proportion of past smokers and drinkers were high in gastric cancer survivors, especially in male (Fig. 1B).

The relationship between considered sociodemographic factors and health behaviors in gastric cancer survivors is described in Table 2. One-year increment of age and female presented less current smoking status (OR, 0.93; 95% CI, 0.88 to 0.99 and OR, 0.16; 95% CI, 0.05 to 0.46). On the other hand, more than 5 years since gastric cancer diagnosis and current drinking contribute to more current smoking (OR, 3.17; 95% CI, 1.27 to 7.90 and OR, 2.48; 95% CI, 1.13 to 5.45). Female was less likely to engage in current drinking (OR, 0.23; 95% CI, 0.14 to 0.40), whereas household income greater and equal to $2,000 and current smoking status are more likely to be associated with current drinking (OR, 1.74; 95% CI, 1.03 to 2.94 and OR, 2.43; 95% CI, 1.11 to 5.33). Female, currently employed state, and normal and unhealthy self-rated health status were associated with more physical inactivity (OR, 2.12; 95% CI, 1.26 to 3.57 and OR, 1.97; 95% CI, 1.24 to 3.12 and OR, 1.57; 95% CI, 1.02 to 2.43), whereas having co-morbid chronic diseases other than gastric cancer were associated with less physical inactivity (OR, 0.65; 95% CI, 0.42 to 0.99).

Discussion

In this study, health behaviors of gastric cancer survivors and cancer-free controls were compared and the associated factors with current unhealthy behaviors including smoking, and drinking, and physical inactivity in gastric cancer survivors were evaluated. From our findings, gastric cancer survivors were currently engaged with a healthier lifestyle in smoking and drinking compared with the cancer free population—91.3% did not smoke and 61.7% did not drink. However, the prevalence of physical inactivity was higher (55.8%) and it was not better than cancer-free controls. The prevalence of these health behaviors in gastric cancer survivors from this nationwide study was similar to that from a single survivorship center [13]. Regarding smoking, our results were similar to the American Cancer Society’s study results: 91.6% of cancer survivors adhered to the smoking recommendation [14]. Although some previous studies conducted in Western regions showed higher or similar prevalence of current smoking and drinking in cancer survivors, compared with the general population [15,16], studies were done in Canada [17] and Korea [18,19] supported good health behaviors among cancer survivors in smoking and drinking.

Maintaining recommended amounts of physical activity is one of the most important factors for cancer survivors to decrease mortality [9,20,21]. A previous study done in Western populations pointed out that cancer survivors’ physical activity status is similar to controls [15]. Our study results were comparable to the results of previous Korean studies, in which the proportion of cancer survivors engaging in physical activity from 26.0% to 50.7% [18,19]. Thus, the importance of physical activity in cancer survivors should be reiterated and educated in the care of gastric cancer survivors.

In our findings, it was shown that the health behaviors in female survivors were not different from matched female controls; on the other hand, male gastric cancer survivors showed better health behaviors than controls. Considering the higher proportion of past smoking and drinking in male gastric cancer survivors compared with matched controls (Fig. 1B), gastric cancer survivors, especially male survivors may be more willing to adopt healthy lifestyles such as quitting smoking or drinking. When we compared the health behaviors of gastric cancer survivors by sex, female gastric cancer survivors were engaged with less smoking and drinking but more physical inactive than male gastric cancer survivors. The result was consistent with existing studies which reported that male cancer survivors were associated with more alcohol consumption [22] and current smoking [18], and the multivariate logistic regression analysis in our study also confirmed the association between gender and health behaviors in gastric cancer survivors.

The relationship between socioeconomic status and health behaviors is well known in the general population [6]. However, the existing literature on household income conflicts with the result that the lower household income of cancer survivors affects cancer survivors’ health status negatively (including general and mental health) [23], whereas the young adult childhood cancer survivors with higher income were prone to binge drinking [22]. Our results showed the increased tendency of alcohol consumption in gastric cancer survivors with higher household income, which was comparable with the previous study done in Korea [18]. A similar pattern was also observed in the general population in China; it might be due to higher income giving more opportunities engage with social networking in not only the general population [24] but also survivors [18,22].

Physical inactivity was influenced by current employment, self-rate health, and co-morbid chronic disease status [15,16,18,21,25]. A previous result offers a good example of long working hours associated with no leisure time for physical activity [26], and it might be a reason for reduced physical activity in gastric cancer survivors in employment status. Cancer survivors whose self-rated health status were marked as normal and unhealthy were engaged in physical inactivity, consistent with previous studies in cancer survivors [27] or the general population [28,29]. Although previous studies did not observe an association between physical activity and chronic disease, surprisingly, gastric cancer survivors who had comorbid conditions were engaged in more physical activity in our study. In Korea, the management of cancer survivors is mostly conducted by cancer specialists [30,31] and the modification of health behaviors through rehabilitation programs has not received much attention in cancer care. In addition, cancer specialists thought they were not well resourced for these programs in Korea [32,33]. However, gastric cancer survivors with chronic diseases may have more opportunity to visit the physicians who managed their chronic diseases to be educated about the importance of exercise. The modification of unhealthy behaviors, especially exercise has been considered to be an important part of the management of chronic diseases [34]. Thus, it is necessary that oncologists stress the importance of physical activity to cancer survivors as it was done in individuals with chronic diseases. There is no doubt of the interrelation among health behavior risk factors in cancer patient; the interdependence between smoking and drinking among cancer survivors were observed in our result as well as in other studies [18,22]. One more noticeable this was that gastric cancer survivors diagnosed ≥ 6 years smoked three times more, suggesting that efforts for long-term lifestyle modification is necessary for gastric cancer survivors.

Despite these findings, there remain some limitations in this study. First, the HEXA data was collected from 38 health examination centers and included individuals over 40 years of age; thus, the individuals in the study might have different social, economic, and health status compared to general population, and our results may not represent whole gastric cancer survivors. Especially, it should be noted that the HEXA data includes individuals over 40 years of age. In addition, survival bias should be considered because only people who survived at the time of the study were included. The information about cancer stage and treatments were not included in this study questionnaire. Thus, the health behavior of cancer survivors in this regard could not be detected. This limitation was observed in several population-based studies on health behaviors in cancer survivors as well [15,16,35]. Thus, including the information in questionnaires used in population-based research would be necessary to understand health behaviors in cancer survivors better. Furthermore, as a nature of self-reported data, the range of smoking and alcohol consumption might have been underestimated; on the other hand, the range of physical activity might have been overestimated [16,19]. Although we proposed several sociodemographic factors associated with health behaviors, temporal information and causality could not be addressed due to the cross-sectional approach of this study. To estimate the number of years since diagnosis, age at interview and age at diagnosis of gastric cancer were applied. Because we did not have information about the exact date of cancer diagnosis and interview, there could be some misclassification.

Notwithstanding these limitations, our study excluded the heterogeneity bias expected in including various cancer sites as previous studies in Korea [18,19]; rather, we focused on gastric cancer which is one of the most commonly prevalent cancers in Asian countries. Gastric cancer survivors who completed treatment and visited health examination centers may more readily return to normal life, and thus, may be primary targets for community-based management for gastric cancer survivors. To increase the comparability of health behaviors, survivors and controls were matched by sex, age, educational level, and income and stratified analysis by sex was performed as well.

To the best of our knowledge, this is the first study to investigate the health behaviors and associated sociodemographic factors in gastric cancer survivors who completed treatment and returned to normal life. Gastric cancer survivors, especially male survivors, presented better health behaviors regarding smoking and drinking compared with controls, but their physical activity level was not better, and the proportion of physical activity below the recommended level was more than 50%. These lifestyle factors are modifiable and improve the prognosis of cancer survivors. However, efforts to induce healthy behavior in gastric cancer survivors are often neglected during cancer treatment and rehabilitation. Several sociodemographic characteristics were associated with unhealthy behaviors among gastric cancer survivors. Identifying gastric cancer survivors vulnerable to unhealthy lifestyles would allow intervention programs to effectively target their limited resources. In addition, further studies are needed to explore why some gastric cancer survivors continue to engage in unhealthy behaviors.

NOTES

Conflict of interest relevant to this article was not reported.

Acknowledgements

This study was supported by a Grant-in-Aid for Cancer Research and Control from the National Cancer Center of Korea (No. 1710171) to Dr. Boyoung Park. This study used data from the Korean Genome Analysis Project (4845-301), the Korean Genome and Epidemiology Study (4851-302), and the Korea Biobank Project (4851-307, KBP-2014-041), which were supported by the Korea Centers for Disease Control and Prevention, Republic of Korea.

Fig. 1.

Prevalence of smoking, drinking, and physical activity status in gastric cancer survivors compared with non-cancer matched controls. (A) Prevalence in both. (B) Prevalence in male. (C) Prevalence in female.

Table 1.

Comparison of characteristics between gastric cancer survivors and matched non-cancer controls

Characteristic^a)	Survivors (n=437)	Non-cancer controls (n=4,370)	p-value^b)
Age, mean (95% CI)	58.6 (57.9-59.4)	58.5 (58.2-58.7)	0.650
Age (yr)
< 50	64 (14.7)	640 (14.7)	1.000
50-54	75 (17.2)	750 (17.2)
55-59	75 (17.2)	750 (17.2)
≥ 60	223 (51.0)	2,230 (51.0)
Sex
Male	232 (53.1)	2,320 (53.1)	1.000
Female	205 (46.9)	2,050 (47.0)
Marital status
Married, cohabitation	399 (91.7)	3,856 (88.7)	0.054
Divorced, widow, unmarried	36 (8.3)	492 (11.3)
Educational attainment
≤ High school	323 (74.8)	3,178 (73.5)	0.562
> College	109 (25.2)	1,147 (26.5)
Household income
< $2,000	186 (48.1)	1,815 (46.8)	0.629
≥ $2,000	201 (52.0)	2,065 (53.2)
Employment state
Currently unemployed	230 (53.1)	2,037 (47.6)	0.029
Currently employed	203 (46.9)	2,242 (52.4)
Self-rated health status
Healthy	157 (36.3)	1,797 (41.5)	0.034
Normal-unhealthy	276 (63.7)	2,532 (58.5)
Co-morbid chronic disease^c)
Yes	226 (51.7)	2,308 (52.8)	0.661
No	211 (48.3)	2,062 (47.2)
Family history of cancer (any type)
Yes	178 (41.1)	1,079 (24.8)	< 0.001
No	255 (58.9)	3,275 (75.2)
Years since diagnosis
2-5	161 (36.8)	-	< 0.001
≥ 6	271 (62.0)	-
Current smoking status
Yes	38 (8.7)	668 (15.4)	0.001
No	397 (91.3)	3,685 (84.7)
Current drinking status
Yes	166 (38.3)	2,162 (49.7)	< 0.001
No	267 (61.7)	2,192 (50.3)
Physical activity
< 150 min/wk	242 (55.8)	2,521 (59.9)	0.095
≥ 150 min/wk	192 (44.2)	1,688 (40.1)
BMI
< 23	278 (63.6)	1,535 (35.2)	< 0.001
≥ 23	159 (36.4)	2,826 (64.8)

Values are presented as number (%) unless otherwise indicated. CI, confidence intervals; BMI, body mass index.

^a) Missing values (No. of survivors, No. of non-cancer controls): marital status (2, 22), educational attainment (5, 45), household income (50, 490), employment state (4, 91), self-rated health status (4, 41), family history of cancer (4, 16), current smoking status (2, 17), current drinking status (4, 16), physical activity (3, 161), BMI (0, 9),

^b) Chi-square test or t test results,

^c) Any of following diseases were classified as chronic disease: hypertension, diabetes, dyslipidemia, stroke, transient ischemic attacks, angina or myocardiac infarction, colon polyp, fatty liver, chronic liver disease or liver cirrhosis, gallbladder stone or cholecystitis, thyroid disease, arthritis, and osteoporosis.

Table 2.

Association between sociodemographic characteristics and health behaviors among gastric cancer survivors in multivariate logistic regression analysis

Characteristic	Current smoking		Current drinking		Physical inactivity^a)
Characteristic	Odds ratio (95% confidence interval)	p-value	Odds ratio (95% confidence interval)	p-value	Odds ratio (95% confidence interval)	p-value
Age, 1-year increment	0.93 (0.88-0.99)	0.024	1.00 (0.97-1.03)	1.000	1.00 (0.97-1.04)	0.846
Sex
Male	1		1		1
Female	0.16 (0.05-0.46)	0.001	0.23 (0.14-0.40)	< 0.001	2.12 (1.26-3.57)	0.005
Marital status
Divorced, widow, unmarried	1		1		1
Married, cohabitation	0.41 (0.10-1.77)	0.233	0.81 (0.34-1.94)	0.633	0.96 (0.43-2.13)	0.921
Educational attainment
≤ High school	1		1		1
> College	0.39 (0.14-1.09)	0.073	0.85 (0.50-1.44)	0.543	0.67 (0.41-1.10)	0.115
Household income
< $2,000	1		1		1
≥ $2,000	0.66 (0.26-1.69)	0.388	1.74 (1.03-2.94)	0.040	1.00 (0.62-1.63)	0.999
Employment state
Currently unemployed	1		1		1
Currently employed	1.86 (0.76-4.56)	0.175	1.36 (0.84-2.21)	0.208	1.97 (1.24-3.12)	0.004
Self-rated health status
Healthy	1		1		1
Normal-unhealthy	1.37 (0.61-3.08)	0.441	0.84 (0.53-1.35)	0.475	1.57 (1.02-2.43)	0.042
Family history of cancer^a)
No	1		1		1
Yes	1.40 (0.66-3.00)	0.382	0.94 (0.60-1.46)	0.775	1.04 (0.69-1.57)	0.851
Co-morbid chronic disease^b)
No	1		1		1
Yes	0.56 (0.25-1.27)	0.165	0.97 (0.61-1.53)	0.889	0.65 (0.42-0.99)	0.048
Years since diagnosis
≤ 5	1		1		1
> 6	3.17 (1.27-7.90)	0.013	1.44 (0.90-2.28)	0.127	1.31 (0.86-2.01)	0.213
Current smoking
No	-		1		1
Yes	-	-	2.43 (1.11-5.33)	0.027	1.10 (0.52-2.33)	0.803
Current drinking
No	1		-		1
Yes	2.48 (1.13-5.45)	0.024	-	-	1.13 (0.72-1.78)	0.594
Physical activity
< 150 min/wk	1		1		-
≥ 150 min/wk	0.98 (0.45-2.16)	0.960	0.89 (0.56-1.40)	0.607	-	-
Body mass index
< 23 kg/m²	1		1		1
≥ 23 kg/m²	0.67 (0.30-1.54)	0.351	1.39 (0.88-2.19)	0.155	0.77 (0.50-1.17)	0.216

Values are presented as number (%).

^a) Any type of cancer,

^b) Any of following diseases were classified as chronic disease: hypertension, diabetes, dyslipidemia, stroke, transient ischemic attacks, angina or myocardial infarction, colon polyp, fatty liver, chronic liver disease or liver cirrhosis, gallbladder stone or cholecystitis, thyroid disease, arthritis, and osteoporosis.

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Risky Lifestyle Behaviors among Gastric Cancer Survivors Compared with Matched Non-cancer Controls: Results from Baseline Result of Community Based Cohort Study

Cancer Res Treat. 2018;50(3):738-747. Published online July 24, 2017

DOI: https://doi.org/10.4143/crt.2017.129

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Abstract
Introduction
Materials and Methods
Results
Discussion
NOTES
REFERENCES

Risky Lifestyle Behaviors among Gastric Cancer Survivors Compared with Matched Non-cancer Controls: Results from Baseline Result of Community Based Cohort Study

Fig. 1. Prevalence of smoking, drinking, and physical activity status in gastric cancer survivors compared with non-cancer matched controls. (A) Prevalence in both. (B) Prevalence in male. (C) Prevalence in female.

Fig. 1.

Risky Lifestyle Behaviors among Gastric Cancer Survivors Compared with Matched Non-cancer Controls: Results from Baseline Result of Community Based Cohort Study

Characteristic^a)	Survivors (n=437)	Non-cancer controls (n=4,370)	p-value^b)
Age, mean (95% CI)	58.6 (57.9-59.4)	58.5 (58.2-58.7)	0.650
Age (yr)
< 50	64 (14.7)	640 (14.7)	1.000
50-54	75 (17.2)	750 (17.2)
55-59	75 (17.2)	750 (17.2)
≥ 60	223 (51.0)	2,230 (51.0)
Sex
Male	232 (53.1)	2,320 (53.1)	1.000
Female	205 (46.9)	2,050 (47.0)
Marital status
Married, cohabitation	399 (91.7)	3,856 (88.7)	0.054
Divorced, widow, unmarried	36 (8.3)	492 (11.3)
Educational attainment
≤ High school	323 (74.8)	3,178 (73.5)	0.562
> College	109 (25.2)	1,147 (26.5)
Household income
< $2,000	186 (48.1)	1,815 (46.8)	0.629
≥ $2,000	201 (52.0)	2,065 (53.2)
Employment state
Currently unemployed	230 (53.1)	2,037 (47.6)	0.029
Currently employed	203 (46.9)	2,242 (52.4)
Self-rated health status
Healthy	157 (36.3)	1,797 (41.5)	0.034
Normal-unhealthy	276 (63.7)	2,532 (58.5)
Co-morbid chronic disease^c)
Yes	226 (51.7)	2,308 (52.8)	0.661
No	211 (48.3)	2,062 (47.2)
Family history of cancer (any type)
Yes	178 (41.1)	1,079 (24.8)	< 0.001
No	255 (58.9)	3,275 (75.2)
Years since diagnosis
2-5	161 (36.8)	-	< 0.001
≥ 6	271 (62.0)	-
Current smoking status
Yes	38 (8.7)	668 (15.4)	0.001
No	397 (91.3)	3,685 (84.7)
Current drinking status
Yes	166 (38.3)	2,162 (49.7)	< 0.001
No	267 (61.7)	2,192 (50.3)
Physical activity
< 150 min/wk	242 (55.8)	2,521 (59.9)	0.095
≥ 150 min/wk	192 (44.2)	1,688 (40.1)
BMI
< 23	278 (63.6)	1,535 (35.2)	< 0.001
≥ 23	159 (36.4)	2,826 (64.8)

Characteristic	Current smoking		Current drinking		Physical inactivity^a)
Characteristic	Odds ratio (95% confidence interval)	p-value	Odds ratio (95% confidence interval)	p-value	Odds ratio (95% confidence interval)	p-value
Age, 1-year increment	0.93 (0.88-0.99)	0.024	1.00 (0.97-1.03)	1.000	1.00 (0.97-1.04)	0.846
Sex
Male	1		1		1
Female	0.16 (0.05-0.46)	0.001	0.23 (0.14-0.40)	< 0.001	2.12 (1.26-3.57)	0.005
Marital status
Divorced, widow, unmarried	1		1		1
Married, cohabitation	0.41 (0.10-1.77)	0.233	0.81 (0.34-1.94)	0.633	0.96 (0.43-2.13)	0.921
Educational attainment
≤ High school	1		1		1
> College	0.39 (0.14-1.09)	0.073	0.85 (0.50-1.44)	0.543	0.67 (0.41-1.10)	0.115
Household income
< $2,000	1		1		1
≥ $2,000	0.66 (0.26-1.69)	0.388	1.74 (1.03-2.94)	0.040	1.00 (0.62-1.63)	0.999
Employment state
Currently unemployed	1		1		1
Currently employed	1.86 (0.76-4.56)	0.175	1.36 (0.84-2.21)	0.208	1.97 (1.24-3.12)	0.004
Self-rated health status
Healthy	1		1		1
Normal-unhealthy	1.37 (0.61-3.08)	0.441	0.84 (0.53-1.35)	0.475	1.57 (1.02-2.43)	0.042
Family history of cancer^a)
No	1		1		1
Yes	1.40 (0.66-3.00)	0.382	0.94 (0.60-1.46)	0.775	1.04 (0.69-1.57)	0.851
Co-morbid chronic disease^b)
No	1		1		1
Yes	0.56 (0.25-1.27)	0.165	0.97 (0.61-1.53)	0.889	0.65 (0.42-0.99)	0.048
Years since diagnosis
≤ 5	1		1		1
> 6	3.17 (1.27-7.90)	0.013	1.44 (0.90-2.28)	0.127	1.31 (0.86-2.01)	0.213
Current smoking
No	-		1		1
Yes	-	-	2.43 (1.11-5.33)	0.027	1.10 (0.52-2.33)	0.803
Current drinking
No	1		-		1
Yes	2.48 (1.13-5.45)	0.024	-	-	1.13 (0.72-1.78)	0.594
Physical activity
< 150 min/wk	1		1		-
≥ 150 min/wk	0.98 (0.45-2.16)	0.960	0.89 (0.56-1.40)	0.607	-	-
Body mass index
< 23 kg/m²	1		1		1
≥ 23 kg/m²	0.67 (0.30-1.54)	0.351	1.39 (0.88-2.19)	0.155	0.77 (0.50-1.17)	0.216

Table 1. Comparison of characteristics between gastric cancer survivors and matched non-cancer controls

Values are presented as number (%) unless otherwise indicated. CI, confidence intervals; BMI, body mass index.

Missing values (No. of survivors, No. of non-cancer controls): marital status (2, 22), educational attainment (5, 45), household income (50, 490), employment state (4, 91), self-rated health status (4, 41), family history of cancer (4, 16), current smoking status (2, 17), current drinking status (4, 16), physical activity (3, 161), BMI (0, 9),

Chi-square test or t test results,

Any of following diseases were classified as chronic disease: hypertension, diabetes, dyslipidemia, stroke, transient ischemic attacks, angina or myocardiac infarction, colon polyp, fatty liver, chronic liver disease or liver cirrhosis, gallbladder stone or cholecystitis, thyroid disease, arthritis, and osteoporosis.

Table 2. Association between sociodemographic characteristics and health behaviors among gastric cancer survivors in multivariate logistic regression analysis

Values are presented as number (%).

Any type of cancer,

Any of following diseases were classified as chronic disease: hypertension, diabetes, dyslipidemia, stroke, transient ischemic attacks, angina or myocardial infarction, colon polyp, fatty liver, chronic liver disease or liver cirrhosis, gallbladder stone or cholecystitis, thyroid disease, arthritis, and osteoporosis.