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Table 3 Risk of type 2 diabetes in adulthood according to non-screen based sedentary behaviors at age 16

From: Do adolescent sedentary behavior levels predict type 2 diabetes risk in adulthood?

  N Person-years of follow-up Number of cases of type 2 diabetes Type 2 diabetes cases/10,000 person-years Hazard ratio (95% confidence interval) for type 2 diabetes
Model 1 Model 2 Model 3
Homework
 None 2512 67,060 59 9 1 1 1
 1–30 min/day 373 10,022 9 9 1.01 (0.50, 2.04) 1.12 (0.55, 2.26) 1.13 (0.56, 2.31)
  > 30 min/day 1057 28,608 23 8 0.89 (0.55, 1.44) 1.05 (0.65, 1.72) 1.13 (0.67, 1.86)
Reading
 None 2246 59,986 47 8 1 1 1
 1–30 min/day 1082 29,148 30 10 1.30 (0.82, 2.05) 1.39 (0.87, 2.20) 1.39 (0.87, 2.22)
  > 30 min/day 614 16,556 14 8 1.07 (0.59, 1.94) 1.15 (0.63, 2.10) 1.13 (0.62, 2.07)
Reading and doing homework
 None 1479 39,220 31 8 1 1 1
 1–120 min/day 1643 44,338 43 10 1.20 (0.75, 1.90) 1.34 (0.84, 2.14) 1.37 (0.86, 2.19)
  > 120 min/day 820 22,132 17 8 0.94 (0.52, 1.70) 1.16 (0.64, 2.12) 1.24 (0.68, 2.27)
  1. Model 1 is unadjusted. Model 2 is adjusted for sex, BMI category, sugary beverage consumption, smoking status, physical activity at baseline and physical activity in adulthood. Ethnicity, parental education, fruit consumption, and takeout eating were removed during the stepwise elimination process. Model 3 is adjusted for Model 2 covariates plus the other sedentary behavior variables (e.g., homework was adjusted for TV and videos, computer, and reading)