Table 4 Explaining sleep disorders – results of stepwise multiple linear regression analyses
Dependent variable: Sleep disorders (single-item scale from 1 ‘not at all’ to 3 ‘severe’) | Nurses (and midwives) | Physicians | Therapists and other health professionals | All health professionals | ||||
|---|---|---|---|---|---|---|---|---|
n = 718 | n = 222 | n = 292 | N = 1232 | |||||
beta coeff. (β) | beta coeff. (β) | beta coeff. (β) | beta coeff. (β) | |||||
Step 1 | Step 2 | Step 1 | Step 2 | Step 1 | Step 2 | Step 1 | Step 2 | |
(Independent variables:) | ||||||||
Musculoskeletal disorders (two-item scale from 0 ‘none’ to 4 ‘very severe’) | .24*** | .11** | .12 | −.01 | .20*** | .09 | .21*** | .09** |
General stress (single-item scale from 1 ‘not at all’ to 5 ‘very strong’) | – | .33*** | – | .38*** | – | .44*** | – | .36*** |
Work stress (ERI ratio from 0.3 ‘lowest’ to 3.7 ‘highest’) | – | .07 | – | .11 | – | .01 | – | .06 |
Physical effort at work (three-item scale from 0 ‘lowest’ to 12 ‘highest’) | – | −.01 | – | −.12 | – | −.05 | – | −.03 |
Poor posture at work (single-item scale from 0 ‘never’ to 4 ‘permanently’) | – | .09 | – | .05 | – | −.02 | – | .06 |
(Control variables:) | ||||||||
Sex (male) | .03 | .05 | −.04 | −.05 | .08 | .03 | .02 | .01 |
Age (< 25, 25–34, 35–44, 45–54, 55+) | .14*** | .15*** | .11 | .13 | .17** | .13* | .14*** | .14*** |
Educational level (scale from 1 ‘low’ to 4 ‘very high’) | .02 | .02 | .00 | −.05 | −.01 | −.05 | .02 | −.01 |
Adjusted R square | .070 | .211 | .006 | .150 | .053 | .217 | .057 | .203 |
No. cases in model | 689 | 577 | 210 | 185 | 288 | 252 | 1189 | 1016 |