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Published on: July 22, 2016
Sedentary leisure-time in relation to mortality and survival time
Susanna C Larsson1, Alicja Wolk1
1Unit of Nutritional Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Sweden; Department of Surgical Sciences, Uppsala University, Uppsala, Sweden.
Objective:
To examine the association between sedentary leisure-time and all-cause mortality and differences in survival time.
Design:
Prospective cohort study.
Methods:
Information on sedentary leisure-time, defined as TV viewing and/or sitting reading, was collected from 72003 Swedish adults who were 45-83 (median 60) years of age and completed a self-administered questionnaire at baseline and were followed up for 17years through linkage with the Swedish Death Register.
Results:
The association between sedentary leisure-time and all-cause mortality was modified by age with a more pronounced association in middle-aged (<60years of age) than in older adults (≥60years of age) (p-interaction<0.001). During follow-up, 3358 and 15217 deaths occurred in the middle-aged and older age group, respectively. The multivariable-adjusted hazard ratios for the highest (>6h/day) versus lowest category (<1h/day) of sedentary leisure-time were 1.72 (95% confidence interval [CI] 1.29-2.30) in middle-aged adults and 1.19 (95% CI 1.05-1.36) in older adults. This corresponded to a difference in survival time of respectively 2.4 (95% CI -4.1 to -0.8) years and 1.5 (95% CI -2.2 to -0.7) years.
Conclusions:
Prolonged sedentary leisure-time was associated with a significantly decreased survival time up to 2.4 years in middle-aged adults.
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