Risk factors for injuries in the workplace
| Factor | Injuries (n) | Person-years | Rate/100 person-years | Adjusted rate ratio3-150 (95% CI) |
| Age group (y): | ||||
| <20 | 891 | 7084 | 12.6 | 1.00 |
| 20–24 | 3240 | 35003 | 9.3 | 0.76 (0.70 to 0.83) |
| 25–29 | 2799 | 44958 | 6.2 | 0.61 (0.56 to 0.66) |
| 30–34 | 1780 | 42197 | 4.2 | 0.51 (0.46 to 0.55) |
| 35–39 | 1043 | 30358 | 3.4 | 0.42 (0.38 to 0.47) |
| 40–44 | 628 | 18438 | 3.4 | 0.40 (0.36 to 0.45) |
| ⩾45 | 510 | 16183 | 3.2 | 0.35 (0.31 to 0.40) |
| χ1 2 trend=715, p<0.0001 | ||||
| Duration of employment (y): | ||||
| <1 | 1547 | 11281 | 13.7 | 1.00 |
| 1–1.9 | 1400 | 11947 | 11.7 | 0.89 (0.82 to 0.95) |
| 2–4.9 | 3278 | 37394 | 8.8 | 0.72 (0.67 to 0.76) |
| 5–9.9 | 2346 | 52528 | 4.5 | 0.47 (0.44 to 0.51) |
| 10–14.9 | 1293 | 42853 | 3.0 | 0.39 (0.36 to 0.42) |
| ⩾15 | 1027 | 38218 | 2.7 | 0.30 (0.27 to 0.33) |
| χ1 2 trend=1192, p<0.0001 | ||||
| Calendar period: | ||||
| 1977–80 | 5636 | 49174 | 11.5 | 1.00 |
| 1981– 84 | 2538 | 51965 | 4.9 | 0.53 (0.51 to 0.56) |
| 1985–88 | 1671 | 50526 | 3.3 | 0.40 (0.38 to 0.43) |
| 1989–92 | 1046 | 42557 | 2.5 | 0.33 (0.30 to 0.35) |
| χ1 2 trend=1524, p<0.0001 | ||||
| Total | 10891 | 194222 | 5.6 | |
↵3-150 Age group and duration of employment are adjusted for calendar period and calendar period is adjusted for duration of employment.