Korean J Health Promot KJHP Korean Journal of Health Promotion 2234-2141 2093-5676 Korean Society for Health Promotion and Disease Prevention 10.15384/kjhp.2017.17.4.209 Original Article The Association between Sitting Time and Health-Related Quality of Life According to Body Mass Index in Elderly Korean Oh Yun Hwan 1 2 Moon Ji Hyun 1 2 Kong Mi Hee 1 3 Oh Bumjo 4 Kim Hyeon Ju 1 3 Department of Family Medicine, Jeju Nation University Hospital, Jeju, Korea. Department of Medicine, Graduate School, Jeju National University, Jeju, Korea. Department of Family Medicine, Jeju National University School of Medicine, Jeju, Korea. Department of Family Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea. Corresponding author: Hyeon Ju Kim, MD, PhD. Department of Family Medicine, Jeju National University Hospital, 15 Aran 13-gil, Jeju 63241, Korea. Tel: +82-64-717-1830, Fax: +82-64-717-1581, fmhjukim@hanmail.net 12 2017 28 12 2017 17 4 209 218 19 10 2017 30 11 2017 Copyright © 2017 Korean Society for Health Promotion and Disease Prevention 2017 Korean Society for Health Promotion and Disease Prevention This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Background

Although obesity and health-related quality of life (HRQOL) in elderly are well known to be associated with obesity and sitting time, it is unclear whether effect of sedentary lifestyle on HRQOL is affected by body mass index (BMI) or not. So we analyzed the relationship between sitting time and HRQOL according to BMI groups in elderly Korean.

 Methods

Participants aged over 60 from the 6th Korea National Health and Nutrition Examination Survey (2014 and 2015) were included. Participants were classified as normal weight and overweight/obese groups. Mean sitting times were compared between groups according to the EuroQol 5 dimension (EQ-5D) And logistic regression analyses were performed.

 Results

Men with mobility, usual activity, or pain/discomfort domain problem had longer sitting time. Women with a problem in every domain had longer sitting time. Overweight/obese women with problem showed longer sitting time. Odds ratios (ORs) of mobility, usual activity, pain or discomfort, and low EQ-5D score domain were increased regardless of BMI groups in men. But, ORs of all domains were increased only in overweight/obese group in women.

 Conclusions

In elderly Korean, prolonged sitting time associated with decreased HRQOL. Impaired HRQOL is associated with increased sitting time regardless of BMI in men. But only overweight/obese group showed association between prolonged sitting time and impaired HRQOL in women. These results represents that decrease in quality of life according to the increase of the sitting time differs according to the BMI in elderly Korean women.

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Shown are comparisons of adjusted mean sitting times between subjects with or without problem within each EQ-5D domain. <italic>P</italic>-values were calculated by <italic>t</italic>-test. Sitting time were adjusted for age, alcohol, smoking, physical activity, residential area, income, education, marital status, and comorbidities (hypertension, hypercholesterolemia, diabetes, coronary heart disease, stroke, COPD, arthritis, and cancer).

Abbreviations: EQ-5D, EuroQol comprising five dimensions; COPD, chronic obstructive pulmonary disease.

aP<0.01.

 Mean sitting time according to EQ-5D domain problem by sex and BMI categories. Shown are comparisons of adjusted mean sitting times between subjects with or without problem within each EQ-5D domain. <italic>P</italic>-values were calculated by <italic>t</italic>-test. Sitting time were adjusted for age, alcohol, smoking, physical activity, residential area, income, education, marital status, comorbidities (hypertension, hypercholesterolemia, diabetes, coronary heart disease, stroke, COPD, arthritis, cancer).

Abbreviations: EQ-5D, EuroQol comprising five dimensions; BMI, body mass index; COPD, chronic obstructive pulmonary disease.

aP<0.01.

bP<0.05.

 Baseline characteristic according to sex and BMI categories<sup>a</sup>

Abbreviations: BMI, body mass index; LPA, low physical activity; MPA, moderate physical activity; HPA, high physical activity; COPD. chronic obstructive pulmonary disease; EQ-5D, EuroQol comprising five dimensions.

aValues are represented as number (%) or mean±standard error unless otherwise indicated.

bP-value by independent t-test (conticuous variables) or χ2 test (categorical variavles).

cDefined as consuming more than 7/5 (man/woman) standard alcoholic drinks at one time more than twice a week.

 ORs and 95% CI for impaired status of health related quality of life<sup>a</sup> per hour increase in sitting time by sex and BMI categories

Abbreviations: OR, odds ratio; CI, confidence interval; BMI, body mass index; EQ-5D, EuroQol comprising five dimensions; COPD, chronic obstructive pulmonary disease.

Values are presented as OR (95% CI); OR (95% CI) by logistic regression analyses.

aImpaired status of health related quality of life: some or extreme problems in EQ-5D domains and the lowest 20% in EQ-5D index score.

bModel 1: adjusted for age

cP<0.05.

dP<0.01.

eModel 2: adjusted for age, alcohol, smoking, physical activity, residential area, income, education, and marital status.

fModel 3: adjusted for age, alcohol, smoking, physical activity, residential area, income, education, marital status, and comorbidities (hypertension, hypercholesterolemia, diabetes, coronary heart disease, stroke, COPD, arthritis, and cancer).