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Table 4 Quality assessment of included firefighter and police studies

From: Prostate cancer in firefighting and police work: a systematic review and meta-analysis of epidemiologic 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)
   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