Television viewing time and all-cause mortality: interactions with BMI, physical activity, smoking, and dietary factors
Year: 2022
Type: article
Study design: Observational Study
Abstract: BACKGROUND: Higher levels of time spent sitting (sedentary behavior) contribute to adverse health outcomes, including earlier death. This effect may be modified by other lifestyle factors. We examined the association of television viewing (TV), a common leisure-time sedentary behavior, with all-cause mortality, and whether this is modified by body mass index (BMI), physical activity, smoking, alcohol intake, soft drink consumption, or diet-associated inflammation. METHODS: Using data from participants in the Melbourne Collaborative Cohort Study, flexible parametric survival models assessed the time-dependent association of self-reported TV time (three categories: < 2 h/day, 2-3 h/day, > 3 h/day) with all-cause mortality. Interaction terms were fitted to test whether there was effect modification of TV time by the other risk factors. RESULTS: From 19,570 participants, 4,417 deaths were reported over a median follow up of 14.5 years. More TV time was associated with earlier mortality; however, this relationship diminished with increasing age. The hazard ratio (HR) and 95% confidence interval (95% CI) for > 3 h/day compared with < 2 h/day of TV time was 1.34 (1.16, 1.55) at 70 years, 1.14 (1.04, 1.23) at 80 years, and 0.95 (0.84, 1.06) at 90 years. The TV time/mortality relationship was more evident in participants who were physically inactive (compared with active; p for interaction < 0.01) or had a higher dietary inflammatory index score (compared with a lower score; p for interaction = 0.03). No interactions were detected between TV time and BMI, smoking, alcohol intake, nor soft-drink consumption (all p for interaction > 0.16). CONCLUSIONS: The relationship between TV time and all-cause mortality may change with age. It may also be more pronounced in those who are otherwise inactive or who have a pro-inflammatory diet.
Institutions: The University of Melbourne, Cancer Council Victoria, Baker Heart and Diabetes Institute, Australian Catholic University, Swinburne University of Technology, La Trobe University, University of South Carolina, Connecting Health Innovations (United States), Monash Health, Monash University
Language: English
Topic: Physical Activity and Health
Subfield: Physiology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $2,875
Awards: G2037793313, Health 2020, G3729156826, G602992300, Epidemiology of Chronic Disease, Health Interventions and DNA Studies, G7199237069, Alcohol, diet and body fatness as risk factors for stomach cancer and its subtypes: a pooled analysis of prospective studies from the NCI Cohort Consortium, Precision Public Health for major cancers - novel approaches to building the genetic, epigenetic and lifestyle knowledge base for assessing risk and prognosis, G734127494, G8123808567, G8797697851
OpenAlex ID: W4221105781