Results:

Data from 51,896 individuals (mean age 37.2 years, 50% female) were included in this study including 10,359 children, 9,639 adolescents, and 31,898 adults. The estimated prevalence of sitting watching television or videos for ≥2 hours/day was high among all ages (children, 62% [95% CI, 57-67%]; adolescents, 59% [95% CI, 54-65%]; adults, 65% [95% CI, 61-69%]; adults aged 20-64 years, 62% [95% CI, 58-66%]; and ≥65 years, 84% [95% CI, 81-88%] in the 2015-2016 cycle). From 2001-2016, the trends decreased among children over time (difference, −3.4% [95% CI, −11% to 4.5%]; p for trend = 0.004), driven by non-Hispanic white children. Sedentary trends were stable among adolescents (−4.8% [95% CI, −12% to 2.3%]; p for trend = 0.60) and among adults aged 20-64 years (−0.7% [95% CI, −5.6% to 4.1%]; p for trend = 0.82). Sedentary behaviors increased among adults aged ≥65 years (difference, 3.5% [95% CI, −1.2% to 8.1%]; p for trend = 0.03). The estimated prevalence of computer use outside school or work for ≥1 hour/day increased in all ages including children (difference, 13% [95% CI, 5.6-21%]); adolescents (difference, 4.8% [95% CI, −1.8% to 11%]); and adults (difference, 21% [95% CI, 18-25%]). From 2007 to 2016, total hours per day of sitting time increased among adolescents and adults by 1 hour to 8.2 hours (95% CI, 7.9-8.4) for adolescents, and to 6.4 (95% CI, 6.2-6.6) for adults.