Table 2 Baseline predictors of carpal tunnel surgery
Risk factor | Hands | Hands treated by surgery | |||||
|---|---|---|---|---|---|---|---|
| Â | N | N | (%) | PRRa | (95% CI) | PRRb | (95% CI) |
Sex | Â | Â | Â | Â | Â | Â | Â |
  Male | 180 | 44 | 24.4 | 1 |  | 1 |  |
  Female | 476 | 110 | 23.1 | 0.9 | (0.7–1.3) | 1.0 | (0.7–1.4) |
Age (years) | Â | Â | Â | Â | Â | Â | Â |
  <40 | 93 | 23 | 24.7 | 1 |  | 1 |  |
  40–49 | 193 | 46 | 23.8 | 1.0 | (0.6–1.6) | 0.8 | (0.5–1.4) |
  50–59 | 271 | 61 | 22.5 | 0.9 | (0.6–1.5) | 0.9 | (0.6–1.5) |
  ≥60 | 99 | 24 | 24.2 | 1.0 | (0.6–1.7) | 0.9 | (0.5-1.6) |
Distribution of numbness/tingling | Â | Â | Â | Â | Â | Â | Â |
  Other | 80 | 13 | 16.3 | 1 |  | 1 |  |
  Limited median | 172 | 30 | 17.4 | 1.1 | (0.6–2.1) | 0.9 | (0.5–1.8) |
  Extensive median | 381 | 109 | 28.6 | 1.8 | (1.0–3.1) | 1.2 | (0.7–2.1) |
  None | 23 | 2 | 8.7 | - | - |  |  |
Tinel’s test |  |  |  |  |  |  |  |
  Negative | 371 | 64 | 17.3 | 1 |  | 1 |  |
  Positive | 192 | 68 | 35.4 | 2.1 | (1.5–2.9) | 1.2 | (0.8–1.7) |
  Missing | 93 | 22 | 23.7 | - |  | - |  |
Phalen’s test |  |  |  |  |  |  |  |
  Negative | 222 | 20 | 9.0 | 1 |  | 1 |  |
  Positive | 347 | 112 | 32.3 | 3.6 | (2.2–5.8) | 2.4 | (1.4–4.0) |
  Missing | 87 | 22 | 25.3 | - |  | - |  |
Median sensory nerve conduction | Â | Â | Â | Â | Â | Â | Â |
  Normal | 322 | 27 | 8.4 | 1 |  | 1 |  |
  Abnormal | 267 | 101 | 37.8 | 4.5 | (3.0–6.9) | 3.6 | (2.3–5.5) |
  Missing | 67 | 26 | 38.8 | - |  | - |  |