Table 2.
Fit indices of structural equation models for the longitudinal associations between physical activity and work-related fatigue, and physical activity and task demands
| Model | χ 2 | df | NNFI | CFI | AGFI | RMSEA | Model comparison | Δdf | Δχ 2 |
|---|---|---|---|---|---|---|---|---|---|
| Physical activity and work-related fatigue (H1a and H1b) | |||||||||
| M1 (no causation) | 57.48 | 12 | 0.92 | 0.97 | 0.98 | 0.04 | |||
| M2 (normal causation) | 49.62 | 11 | 0.93 | 0.98 | 0.98 | 0.04 | M1 versus M2 | 1 | 7.86** |
| M3 (reversed causation) | 39.39 | 11 | 0.95 | 0.98 | 0.98 | 0.03 | M1 versus M3 | 1 | 18.09** |
| M4 (reciprocal causation) | 31.65 | 10 | 0.95 | 0.99 | 0.99 | 0.03 | M2 versus M4 | 1 | 17.97** |
| M3 versus M4 | 1 | 7.74** | |||||||
| Physical activity and task demands (H2a and H2b) | |||||||||
| M1 (no causation) | 58.05 | 12 | 0.93 | 0.98 | 0.98 | 0.04 | |||
| M2 (normal causation) | 54.93 | 11 | 0.93 | 0.98 | 0.98 | 0.04 | M1 versus M2 | 1 | 3.12 |
| M3 (reversed causation) | 57.12 | 11 | 0.93 | 0.98 | 0.98 | 0.04 | M1 versus M3 | 1 | 0.93 |
| M4 (reciprocal causation) | 53.99 | 10 | 0.92 | 0.98 | 0.98 | 0.04 | M2 versus M4 | 1 | 0.94 |
| M3 versus M4 | 1 | 3.13 | |||||||
The models are controlled for gender, age, education, working overtime, and working irregular hours
* p < 0.05; ** p < 0.01
Bold indicates best fitting model