The association between loge CRP and napping or time spent in bed at night, by subgroups
| Napping (reference: no) | Time spent in bed at night (reference: 6–8 h) | |||||||
|---|---|---|---|---|---|---|---|---|
| Yes | 0–6 h | 8–10 h | >10 h | |||||
| β | (95% CI) | β | (95% CI) | β | (95% CI) | β | (95% CI) | |
| Age | p for interaction=0.007 | p for interaction=0.66 | ||||||
| <70 | 0 | (−0.06 to 0.06) | 0.14 | (−0.25 to 0.52) | 0 | (−0.06 to 0.06) | 0.16* | (0.01 to 0.32) |
| >70 | 0.09** | (0.02 to 0.15) | 0.02 | (−0.59 to 0.63) | 0.03 | (−0.05 to 0.11) | 0.12 | (−0.04 to 0.28) |
| Sex | p for interaction=0.87 | p for interaction=0.82 | ||||||
| Men | 0.04 | (−0.02 to 0.11) | 0.07 | (−0.40 to 0.53) | −0 | (−0.08 to 0.06) | 0.16 | (−0.03 to 0.35) |
| Women | 0.05 | (−0.01 to 0.11) | 0.15 | (−0.33 to 0.62) | 0.02 | (−0.04 to 0.08) | 0.1 | (−0.04 to 0.23) |
| Social class | p for interaction=0.38 | p for interaction=0.31 | ||||||
| Higher | 0.03 | (−0.03 to 0.08) | 0.15 | (−0.27 to 0.57) | 0.01 | (−0.05 to 0.06) | 0.19** | (0.05 to 0.33) |
| Lower | 0.07 | (−0.01 to 0.14) | 0.08 | (−0.45 to 0.61) | 0 | (−0.08 to 0.09) | 0 | (−0.18 to 0.19) |
| Smoking | p for interaction=0.5 | p for interaction=0.55 | ||||||
| Current or former smokers | 0.01 | (−0.05 to 0.08) | 0.12 | (−0.33 to 0.57) | −0 | (−0.10 to 0.05) | 0.12 | (−0.04 to 0.29) |
| Never smoked | 0.06* | (0.01 to 0.12) | 0.11 | (−0.37 to 0.60) | 0.03 | (−0.03 to 0.09) | 0.11 | (−0.04 to 0.26) |
| BMI | p for interaction=0.73 | p for interaction=0.30 | ||||||
| Lower | 0.06 | (−0.00 to 0.12) | −0.15 | (−0.76 to 0.46) | 0.04 | (−0.03 to 0.10) | 0.18* | (0.02 to 0.34) |
| Higher | 0.07* | (0.01 to 0.14) | 0.36 | (−0.05 to 0.77) | −0 | (−0.10 to 0.04) | 0.09 | (−0.07 to 0.25) |
| Physical activity | p for interaction=0.48 | p for interaction=0.41 | ||||||
| Inactive | 0.06* | (0.00 to 0.12) | 0.28 | (−0.14 to 0.71) | 0.02 | (−0.04 to 0.08) | 0.13 | (−0.00 to 0.26) |
| Active | 0.02 | (−0.05 to 0.09) | −0.13 | (−0.65 to 0.38) | −0 | (−0.10 to 0.05) | 0.08 | (−0.14 to 0.29) |
| Pre-existing diseases | p for interaction=0.05 | p for interaction=0.08 | ||||||
| Yes | 0.05 | (−0.25 to 0.35) | NA | 0.19 | (−0.19 to 0.56) | 0.81** | (0.21 to 1.41) | |
| No | 0.05* | (0.01 to 0.10) | 0.11 | (−0.23 to 0.45) | 0.02 | (−0.03 to 0.07) | 0.08 | (−0.04 to 0.20) |
The model adjusted for age, sex, social class, education, marital status and BMI.
Results were presented as β coefficients of linear regression models using loge CRP as the outcome.
*p<0.05 ** p<0.01 ***p<0.001.
BMI, body mass index; CRP, C reactive protein.