Table 2.
Factors | N studies | Combined effect estimates | Q | I2 | NMS | |
---|---|---|---|---|---|---|
RR | 95% CI | |||||
Control | 16 | 1.40 | 1.21-1.61 | 131.1* | 88.6 | 623* |
Control (sub group) | 5 | 1.33 | 1.04-1.69 | 14.5* | 72.5 | 21* |
Demands | 13 | 1.12 | 0.98-1.28 | 60.6* | 80.2 | - |
Demands (sub group) | 4 | 1.14 | 0.80-1.62 | 27.8* | 89.2 | - |
Strain | 5 | 1.45 | 0.96-2.19 | 35.6* | 88.8 | - |
Support | 3 | 1.17 | 0.86-1.61 | 8.9* | 77.4 | |
Shift work (all types) | 8 | 1.08 | 0.92-1.28 | 19.1* | 63.3 | - |
Note: *p < .001
NMS Number of missing studies that would bring p value to > 0.05, based on the fail-safe N method