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Table 2 Logistic regression for occupational cold exposure in relation to reporting symptoms of carpal tunnel syndrome

From: Occupational cold exposure and symptoms of carpal tunnel syndrome – a population-based study

Exposure variable Exposure level Carpal tunnel syndrome References Simple analyses Multiple analyses a
  Proportion of working hours N (%) N (%) Crude OR (95% CI) Adjusted OR (95% CI)
Contact cooling Never 254 (63.3) 2,869 (73.9) Reference Reference
One tenth 74 (18.5) 645 (16.6) 1.30 (0.99–1.70) 1.19 (0.87–1.63)
One quarter 28 (7.0) 182 (4.7) 1.74 (1.14–2.64) 1.60 (0.99–2.56)
Half 16 (4.0) 82 (2.1) 2.20 (1.27–3.82) 1.92 (1.04–3.57)
Three quarters 15 (3.7) 62 (1.6) 2.73 (1.53–4.87) 2.38 (1.26–4.52)
Almost always 14 (3.5) 42 (1.1) 3.77 (2.03–6.99) 3.20 (1.62–6.33)
Ambient cooling Never 227 (56.2) 2,470 (63.6) Reference Reference
One tenth 82 (20.3) 766 (19.7) 1.17 (0.89–1.52) 1.14 (0.85–1.53)
One quarter 48 (11.9) 329 (8.5) 1.59 (1.14–2.21) 1.57 (1.09–2.27)
Half 21 (5.2) 187 (4.8) 1.22 (0.76–1.96) 1.11 (0.66–1.86)
Three quarters 13 (3.2) 68 (1.8) 2.08 (1.13–3.82) 2.10 (1.10–4.01)
Almost always 13 (3.2) 64 (1.6) 2.21 (1.20–4.07) 2.00 (1.03–3.88)
Severe ambient cooling Never 231 (57.5) 2,723 (70.2) Reference Reference
One tenth 81 (20.1) 740 (19.1) 1.29 (0.99–1.68) 1.35 (1.01–1.82)
One quarter 41 (10.2) 198 (5.1) 2.44 (1.70–3.51) 2.45 (1.65–3.64)
Half 22 (5.5) 119 (3.1) 2.18 (1.36–3.50) 2.00 (1.18–3.40)
Three quarters 10 (2.5) 57 (1.5) 2.07 (1.04–4.10) 2.09 (1.02–4.27)
Almost always 17 (4.2) 43 (1.1) 4.66 (2.62–8.30) 4.02 (2.09–7.71)
  1. OR odds ratio, NRS numerical rating scale, 95% CI ninety-five percent confidence interval
  2. aAdjusted for age, gender, body mass index, current daily smoking, diabetes mellitus, joint disease, and hand-arm vibration exposure
  3. Bold values are significant at the 0.05 level