Table 3. Effect modification of gender 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 | ||||||||
| Male | 101/363 | 1.24 (0.98–1.58) | 1,816/8,504 | 0.99 (0.93–1.06) | 3,804/14,031 | 1.00 | 390/1,082 | 1.23 (1.08–1.41) |
| Female | 78/409 | 0.73 (0.56–0.96) | 1,682/12,581 | 0.64 (0.60–0.69) | 2,626/18,367 | 0.57 (0.53–0.60) | 169/814 | 0.76 (0.63–0.91) |
| Ratio of ORs¶ | 1.04 (0.72–1.49) | 1.13 (1.03–1.25) | 1.08 (0.86–1.36) | |||||
| RERI§ | −0.08 (−0.38–0.23) | 0.08 (0.01–0.16) | −0.04 (−0.18–0.10) | |||||
| Obesity | ||||||||
| Male | 50/414 | 1.22 (0.89–1.68) | 822/9,498 | 0.89 (0.81–0.98) | 1,773/16,062 | 1.00 | 203/1,269 | 1.33 (1.12–1.59) |
| Female | 44/443 | 0.80 (0.55–1.15) | 780/13,483 | 0.63 (0.57–0.70) | 1,308/13,483 | 0.64 (0.59–0.69) | 99/884 | 1.01 (0.80–1.27) |
| Ratio of ORs¶ | 1.02 (0.63–1.65) | 1.11 (0.97–1.26) | 1.18 (0.89–1.57) | |||||
| RERI§ | −0.06 (−0.47–0.34) | 0.26 (0.22–0.31) | 0.04 (−0.26–0.33) | |||||
Abrreviations: 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.