Regression coefficients and ORs of the differences in PA levels by frequency of night shifts compared with non-shift workers†
| Shift workers with 0 night shifts/month (n=138) B (95% CI) | 1–4 Night shifts/month (n=148) B (95% CI) | ≥5 Night shifts/month (n=198) B (95% CI) | p-trend | |
|---|---|---|---|---|
| PA type (hours/week) | ||||
| Walking | 0.3 (−1.6 to 2.2) | 2.4 (0.6 to 4.3)* | 3.7 (1.8 to 5.6)* | <0.01 |
| Cycling | 0.3 (−0.3 to 0.9) | −0.5 (−1.1 to 0.1) | 0.7 (0.0 to 1.3) | 0.25 |
| Exercise | 0.1 (−0.4 to 0.6) | 0.0 (−0.4 to 0.4) | 0.1 (−0.4 to 0.5) | 0.69 |
| Chores | 0.2 (−1.5 to 1.9) | −2.3 (−3.6 to −1.1)* | 0.4 (−1.1 to 1.8) | 0.39 |
| PA intensity (hours/week) | ||||
| Moderate PA | 0.5 (−2.3 to 3.2) | 0.1 (−2.1 to 2.3) | 4.1 (1.7 to 6.4)* | <0.01 |
| Vigorous PA | 0.5 (−0.4 to 1.3) | −0.5 (−1.3 to 0.2) | 0.7 (−0.1 to 1.6) | 0.25 |
| Shift workers with 0 night shifts/month (n=138) OR (95% CI) | 1–4 Night shifts/month (n=148) OR (95% CI) | ≥5 Night shifts/month (n=198) OR (95% CI) | p-trend | |
| Sports activities | ||||
| Plays sports (yes) | 1.1 (0.8 to 1.5) | 0.8 (0.6 to 1.1) | 0.9 (0.7 to 1.2) | 0.19 |
| Type of sports (non-individual) | 0.8 (0.4 to 1.4) | 0.7 (0.4 to 1.2) | 1.4 (0.9 to 2.2) | 0.71 |
| Sports intensity (≥6.0 MET) | 1.8 (0.9 to 3.6) | 1.4 (0.8 to 2.4) | 1.1 (0.7 to 1.7) | 0.34 |
Reference group: non-shift workers.
*p<0.05.
†Adjusted for age, gender, educational level, marital status, smoking status, diet and occupational PA.
B, Regression coefficient; MET, metabolic equivalent value; PA, physical activity.