Table 4 Quality assessment of included firefighter and police studies
Quality Assessment Category | Maximum Attainable Score | Studies on firefighters (n = 19) | Studies on police workers (n = 5) | Studies on both firefighters and police workers (n = 7) | All studies (n = 31) | |||
|---|---|---|---|---|---|---|---|---|
| Â | Â | Range | Mean | Range | Mean | Range | Mean | Mean |
Reporting | 9 | 4–9 | 6.0 | 1–8 | 5.4 | 4–8 | 6.1 | 5.9 |
External Validity | 2 | 1–2 | 1.8 | 0–2 | 1.6 | 1–2 | 1.6 | 1.7 |
Internal Validity: Bias | 4 | 3–4 | 3.8 | 3–4 | 3.8 | 4 | 4 | 3.8 |
Internal Validity: Confounding | 4 | 2–4 | 3.2 | 1–4 | 2.8 | 3–4 | 3.6 | 3.2 |
Power | 1 | 0 | 0 | 0 | 0 | 0–1 | 0.1 | 0.0 |
Total | 20 | 10–19 | 14.8 | 5–18 | 13.6 | 12–18 | 15.4 | 14.6 |