Individual factors and RR for RNE decompression surgery (n=92) from crude models
| Factor | N | Person-years | Cases | IR | RR | 95% CI |
| Individual factors | ||||||
| BMI | ||||||
| Normal | 167 884 | 2 128 662 | 66 | 3.10 | 1.00 | – |
| Overweight | 61 823 | 770 667 | 26 | 3.37 | 1.09 | 0.69 to 1.71 |
| Smoking | ||||||
| Never | 103 511 | 1 325 534 | 37 | 2.79 | 1.00 | – |
| Ever | 115 040 | 1 435 386 | 53 | 3.69 | 1.32 | 0.87 to 2.01 |
| Unknown | 11 156 | 138 409 | 2 | 1.44 | 0.52 | 0.13 to 2.15 |
| Age in 2001, years | ||||||
| 25–34 | 32 486 | 419 152 | 9 | 2.15 | 1.00 | – |
| 35–44 | 64 126 | 824 222 | 29 | 3.52 | 1.64 | 0.78 to 3.46 |
| 45–54 | 73 305 | 928 305 | 41 | 4.42 | 2.06 | 1.00 to 4.23 |
| 55–64 | 59 790 | 727 650 | 13 | 1.79 | 0.83 | 0.36 to 1.95 |
IR, incidence rate per 100 000 person-years; N, number workers; RNE, radial nerve entrapment; RR, relative risk.