Table 4. Effect modification of physical activity on associations between sleep duration and overweight/obesity (N = 66,817).
| Variables | Sleep Duration, hours/day | |||||||
|---|---|---|---|---|---|---|---|---|
| <5.0 | 5.0–6.9 | 7.0–8.9 | ≥9.0 | |||||
| Cases/controls | OR (95% CI) | Cases/controls | OR (95% CI) | Cases/controls | OR (95% CI) | Cases/controls | OR (95% CI) | |
| Overweight | ||||||||
| PA = 0 | 119/507 | 1.25 (1.01–1.55) | 2,495/13,951 | 1.08 (1.02–1.15) | 4,865/23,595 | 1.00 | 441/1,442 | 1.30 (1.15 –1.47) |
| PA = 1 | 55/253 | 1.29 (0.94–1.77) | 944/6,813 | 0.99 (0.91–1.08) | 1,411/8,141 | 1.00 (0.93–1.07) | 102/426 | 1.14 (0.90–1.46) |
| Ratio of ORs¶ | 1.03 (0.70–1.51) | 0.92 (0.82–1.02) | 0.87 (0.67–1.15) | |||||
| RERI§ | 0.04 (−0.46–0.53) | −0.09 (−0.20–0.02) | −0.16 (−0.48–0.15) | |||||
| Obesity | ||||||||
| PA = 0 | 62/564 | 1.32 (1.00–1.76) | 110/15,336 | 0.96 (0.88–1.04) | 2,286/26,174 | 1.00 | 231/1,634 | 1.45 (1.24–1.70) |
| PA = 1 | 28/280 | 1.12 (0.72–1.75) | 464/7,293 | 0.94 (0.84–1.05) | 721/8,831 | 1.07 (0.97–1.17) | 60/468 | 1.40 (1.03–1.89) |
| Ratio of ORs¶ | 0.79 (0.47–1.34) | 0.92 (0.79–1.06) | 0.90 (0.64–1.27) | |||||
| RERI§ | −0.27 (−0.86–0.32) | −0.09 (−0.23–0.05) | −0.12 (−0.61–0.36) | |||||
Abrreviations: PA: Physical Activity; OR: Odds Ratio; 95% CI: 95% Confidence Interval; RERI: Relative Excess Risk due to Interaction.
Notes: Cases: the number of participants who were overweight or obese; controls: the number of participants who were not overweight or obese.
¶effect modification on multiplicative scale.
§effect modification on additive scale.