Overall injury rate | Injury rates at unlicensed sites | Injury rates at licensed sites | Rate ratio (95% CI) | P-value | |
---|---|---|---|---|---|
Both Groups | 121 injuries / 2245 person years =5.39 injuries/100 person years | 59 injuries / 995 person years =5.93 injuries/100 person years | 62 injuries / 1250 person years =4.96 injuries/100 person years | 1.20 (0.83–1.71) | 0.33 |
5 years and less of ASGM work experience | 54 injuries / 659 person years =8.19 injuries/100 person years | 20 injuries / 245 person years =8.16 injuries/100 person years | 34 injuries / 414 person years =8.21 injuries/100 person years | 0.99 (0.57–1.73) | 0.99 |
More than 5 years of ASGM work experience | 67 injuries / 1586 person years =4.22 injuries/100 person years | 39 injuries / 750 person years =5.20 injuries/100 person years | 28 injuries / 836 person years =3.35 injuries/100 person years | 1.53 (0.96–2.52) | 0.03 |
Rate Ratio | 1.94 (1.36–2.78) | 1.57 (0.92–2.69) | 2.45 (1.49–4.04) | ||
P-value | < 0.001 | 0.05 | < 0.001 |