Table 4.
Demand-control model for experienced stress, affect and fatigue: estimated beta weights (standard error) for fixed effects and variances for random effects
| Experienced stress | Affect | Fatigue | ||
|---|---|---|---|---|
| Fixed effects | ||||
| Intercept | 27.48 (1.41) | 81.75 (1.41) | 20.30 (1.72) | |
| Shift (1 or 2) | −0.94 (0.97) | −2.33 (1.10) | 0.12 (1.19) | |
| Time into shift (h) | 0.28 (0.12) | −0.34 (0.09) | 2.05 (0.13) | |
| Between persons | Demand | 5.23* (1.17) | −0.49 (1.21) | −0.07 (1.46) |
| Control | −6.99* (2.21) | 6.56* (2.30) | −6.30* (2.77) | |
| Demand × control | 3.89 (2.30) | −3.23 (2.39) | 3.40 (2.88) | |
| Within persons over time | Demand | 2.77* (0.22) | −1.10* (0.16) | 0.26 (0.20) |
| Control | −2.02* (0.48) | 1.83* (0.31) | −1.18* (0.39) | |
| Demand × control | −0.43 (0.25) | 0.41 (0.18) | 0.00 (0.22) | |
| Random effects | ||||
| Person | 100.52 (17.86) | 104.60 (19.50) | 159.83 (27.65) | |
| Shift | 1.87 (7.95) | 27.90 (8.65) | 0 (0) | |
| Time into shift | 181.44 (9.19) | 98.79 (5.21) | 193.44 (9.30) | |
| Alpha (autocorrelation) | 41.35 (8.79) | 35.36 (4.77) | 94.33 (7.96) |
Alpha is a time series parameter: the covariance between two observations t time units apart is alpha × 1 / t
* p < .05 Bonferroni corrected