Table 3. Different discretionary activities, per 20 min/day increase, a and 12-year relative change in waist circumference (cm) from 1996-2008 among 10,500 men in the Health Professionals Follow-up Study.
| Variable | TV watching | Moderate-to-vigorous aerobic activity b | Weight training | Other activities b |
|---|---|---|---|---|
| Waist circumference change (1996-2008) (cm) | ||||
| β0 (95%CI) | β1 (95%CI) | β2 (95%CI) | β3 (95%CI) | |
| Crude model c | 0.08 (0.05, 0.12) | -0.33 (-0.39, -0.27) | -0.66 (-0.89, -0.42) | -0.14 (-0.26, -0.03) |
| Multivariate-adjusted model (a) d | 0.08 (0.05, 0.12) | -0.33 (-0.40, -0.27) | -0.67 (-0.93, -0.41) | -0.16 (-0.28, -0.03) |
Each regression coefficient (95% CI) represents a comparison of waist circumference change (in cm) for every 20 min/day increase in the predictor variable, not restricting total PA time, nor controlling the displacement of other activity time.
Moderate-to-vigorous aerobic activity included brisk/ very brisk walking; jogging, running, bicycling, lap swimming, tennis, squash or racquetball, calisthenics, rowing, and stair or ski machine; other activities included heavy outdoor work (e.g. digging, chopping), and stair climbing.
The crude model was adjusted for baseline (1996) age (years) and waist circumference (continuous, cm), and included 4 main exposure mutually adjusted for each other: TV watching, moderate-to-vigorous physical activity, weight training, and other activities (all continuous, min/day) (all in 2008)
The multivariate model (also called partition model) was adjusted for baseline (1996) age (years), waist circumference (continuous, cm), total average alcohol intake (1994, 2006); sugar-sweetened beverage intake (1994, 2006); percent energy of trans-fat (1994, 2006); energy-adjusted fibers (1994, 2006) (g/day), energy-adjusted glycemic load (1994, 2006); smoking (1996, 2008), anti-depressant intake (1996, 2008), percent energy of protein intake, (1994, 2006), sleep duration (2000, 2008), slow walking (1996, 2008), (min/day, continuous), in addition to TV watching, moderate-to-vigorous aerobic activity, weight training, and other activities (all in 1996) (all continuous, min/day).