Hierarchical regression analysis with sleep-related day shift tolerance total score as the dependent variable (N=584)
| Predictor | B | SE B | β | t | R2/ΔR2 | |
|---|---|---|---|---|---|---|
| Step 1 | 0.015/0.015 | |||||
| Age | −0.02 | 0.019 | −0.06 | −1.26 | ||
| Gender (male=1, female=2) | −0.30 | 0.508 | −0.02 | −0.60 | ||
| Marital status (partner=1, no partner=2) | −0.23 | 0.347 | −0.03 | −0.67 | ||
| Children (yes=1, no=2) | −0.79 | 0.328 | −0.11 | −2.40 | * | |
| Step 2 | 0.018/.004 | |||||
| Age | −0.02 | 0.021 | −0.05 | −0.98 | ||
| Gender (male=1, female=2) | −0.44 | 0.519 | −0.04 | −0.84 | ||
| Marital status (partner=1, no partner=2) | −0.18 | 0.350 | −0.02 | −0.50 | ||
| Children (yes=1, no=2) | −0.70 | 0.338 | −0.10 | −2.05 | * | |
| Alcohol | −0.06 | 0.056 | −0.05 | −0.99 | ||
| Caffeine (cups of caffeine beverages in a day) | −0.04 | 0.065 | −0.03 | −0.65 | ||
| Smoking (yes=1, no=2) | 0.24 | 0.551 | 0.02 | 0.44 | ||
| Step 3 | 0.019/.001 | |||||
| Age | −0.02 | 0.023 | −0.05 | −1.04 | ||
| Gender (male=1, female=2) | −0.40 | 0.524 | −0.03 | −0.76 | ||
| Marital status (partner=1, no partner=2) | −0.17 | 0.352 | −0.02 | −0.49 | ||
| Children (yes=1, no=2) | −0.70 | 0.345 | −0.10 | −2.04 | * | |
| Alcohol | −0.06 | 0.056 | −0.04 | −0.98 | ||
| Caffeine (cups of caffeine beverages in a day) | −0.05 | 0.067 | −0.04 | −0.75 | ||
| Smoking (yes=1, no=2) | 0.23 | 0.553 | 0.02 | 0.42 | ||
| Percentage position | 0.03 | 0.156 | 0.01 | 0.22 | ||
| Number of years worked as a nurse | 0.01 | 0.041 | 0.02 | 0.36 | ||
| Night shifts worked during the last year | 0.00 | 0.006 | 0.02 | 0.45 | ||
| Step 4 | 0.162/.142 *** | |||||
| Age | −0.06 | 0.022 | −0.13 | −2.61 | ** | |
| Gender (male=1, female=2) | −0.67 | 0.492 | −0.05 | −1.36 | ||
| Marital status (partner=1, no partner=2) | −0.06 | 0.329 | −0.01 | −0.19 | ||
| Children (yes=1, no=2) | −0.44 | 0.323 | −0.06 | −1.35 | ||
| Alcohol | −0.06 | 0.052 | −0.04 | −1.05 | ||
| Caffeine (cups of caffeine beverages in a day) | −0.02 | 0.062 | −0.01 | −0.31 | ||
| Smoking (yes=1, no=2) | −0.29 | 0.522 | −0.02 | −0.56 | ||
| Percentage position | 0.01 | 0.145 | 0.00 | 0.08 | ||
| Number of years worked as a nurse | 0.04 | 0.038 | 0.05 | 1.01 | ||
| Night shifts worked during the last year | 0.00 | 0.006 | 0.03 | 0.66 | ||
| Morningness | 0.17 | 0.050 | 0.17 | 3.51 | *** | |
| Languidity | −0.22 | 0.046 | −0.23 | −4.78 | *** | |
| Flexibility | −0.02 | 0.039 | −0.02 | −0.46 | ||
| Hardiness | 0.12 | 0.032 | 0.15 | 3.63 | *** |
*p<0.05, **p<0.01, ***p<0.001.
β , Standardised coefficients; B, non-standardised coefficients; SE B=the SE of β.