Table 4

Odds ratios to predict stability of physical activity levels. Pooled analysis
Weekday/weekend combined Weekday Weekend
Predictor Outcome Boys Girls Boys Girls Boys Girls
Odds ratio (95% confidence interval)
MVPA model Age at follow-up (years) <20%tilea 1.1 (1.1, 1.2) 1.1 (1.0, 1.2) 1.1 (1.0, 1.2) 1.0 (1.0, 1.1) 1.2 (1.1, 1.3) 1.1 (1.0, 1.2)
20- < 80%tilea Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tilea 1.0 (0.9, 1.0) 0.9 (0.9, 1.0) 1.0 (1.0, 1.1) 0.9 (0.9, 1.0) 1.0 (0.9, 1.0) 0.9 (0.8, 0.9)
Follow-up duration (years) <20%tilea 1.1 (1.0, 1.3) 1.1 (0.9, 1.2) 1.1 (0.9, 1.3) 1.1 (0.9, 1.3) 1.3 (1.1, 1.6) 1.0 (0.9, 1.3)
20- < 80%tilea Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tilea 0.9 (0.8, 1.1) 0.9 (0.8, 1.0) 1.0 (0.8, 1.2) 0.9 (0.8, 1.1) 0.8 (0.7, 1.0) 0.8 (0.6, 0.9)
<20%tileb <20%tilea 3.4 (2.7, 4.3) 2.6 (2.1, 3.3) 2.7 (2.1, 3.4) 2.8 (2.3, 3.6) 1.8 (1.4, 2.3) 1.9 (1.4, 2.4)
20- < 80%tileb 20- < 80%tilea Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tileb ≥80%tilea 2.9 (2.3, 3.6) 2.4 (1.9, 3.0) 2.5 (2.0, 3.2) 1.6 (1.2, 2.0) 1.9 (1.4, 2.5) 1.7 (1.3, 2.2)
VPA model Age at follow-up (years) <20%tilec 1.0 (1.0, 1.1) 1.1 (1.0, 1.1) 1.0 (1.0, 1.1) 1.1 (1.0, 1.1) 1.1 (1.1, 1.2) 1.1 (1.1, 1.2)
20- < 80%tilec Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tilec 1.0 (1.0, 1.1) 1.0 (0.9, 1.0) 1.0 (1.0, 1.1) 1.0 (0.9, 1.0) 1.0 (0.9, 1.0) 0.9 (0.9, 1.0)
Follow-up duration (years) <20%tilec 1.1 (0.9, 1.3) 1.0 (0.9, 1.2) 1.0 (0.9, 1.2) 1.1 (0.9, 1.3) 1.4 (1.1, 1.7) 1.2 (1.0, 1.4)
20- < 80%tilec Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tilec 1.0 (0.8, 1.2) 1.0 (0.8, 1.1) 1.0 (0.8, 1.2) 1.0 (0.8, 1.1) 0.9 (0.7, 1.1) 0.9 (0.7, 1.0)
<20%tiled <20%tilec 2.4 (1.9, 3.0) 2.5 (2.0, 3.2) 2.1 (1.6, 2.6) 2.6 (2.1, 3.2) 1.8 (1.4, 2.3) 1.8 (1.4, 2.4)
20- < 80%tiled 20- < 80%tilec Ref. Ref. Ref. Ref. Ref. Ref.
≥80%tiled ≥80%tilec 3.9 (3.1, 4.9) 1.9 (1.5, 2.4) 3.9 (3.1, 5.0) 1.8 (1.4, 2.2) 1.8 (1.3, 2.3) 1.3 (1.0, 1.7)

aMVPA at follow-up; bMVPA at baseline; cVPA at follow-up; dVPA at baseline.

MVPA, moderate- to vigorous-intensity physical activity; VPA, vigorous-intensity physical activity.

All analyses were weighted based on the sample size of each cohort.

Gender- and type of day-specific multinomial logistic regression model: follow-up [M]VPA (<20%tile, 20- < 80%tile, and ≥80%tile; reference group: 20- < 80%tile) = centered age at follow-up (years) + follow-up duration (years) + baseline [M]VPA (<20%tile, 20- < 80%tile, and ≥80%tile; reference group: 20- < 80%tile).

Kwon et al.

Kwon et al. International Journal of Behavioral Nutrition and Physical Activity 2012 9:68   doi:10.1186/1479-5868-9-68

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