Skip to main content

Table 3 Associations with non-occupational risk factors according to neurophysiological findings

From: Differences in risk factors for neurophysiologically confirmed carpal tunnel syndrome and illness with similar symptoms but normal median nerve function: a case–control study

Risk factor Controls NP+ve cases NP-ve cases
  n n ORa (95% CI) n ORa (95% CI)
BMI (Kg/m 2 )        
  <25 303 118 1   154 1  
  ≥25 and <30 254 162 1.6 (1.2-2.2) 151 1.2 (0.9-1.6)
  ≥30 220 184 2.3 (1.7-3.1) 93 0.9 (0.7-1.2)
  Missing 22 11 1.2 (0.5-2.6) 11 0.9 (0.4-1.9)
Smoking habits        
  Never smoked 367 251 1   209 1  
  Ex-smoker 210 136 1.1 (0.8-1.4) 97 0.9 (0.7-1.2)
  Current smoker 213 83 0.6 (0.5-0.8) 101 0.8 (0.6-1.1)
  Missing 9 5 0.6 (0.2-2.3) 2 0.4 (0.1-2.0)
Other disease b        
  Diabetes 56 37 1.1 (0.7-1.7) 18 0.7 (0.4-1.2)
  Rheumatoid arthritis 32 23 1.3 (0.8-2.3) 19 1.3 (0.7-2.3)
  Other arthritis 169 92 1.0 (0.8-1.4) 92 1.3 (1.0-1.8)
Mental health        
  Good 333 170 1   157 1  
  Intermediate 236 155 1.2 (0.9-1.7) 142 1.4 (1.0-1.8)
  Poor 225 148 1.3 (1.0-1.8) 108 1.1 (0.8-1.5)
  Missing 5 2 0.5 (0.1-3.7) 2 0.9 (0.2-4.8)
Number of somatic symptoms at least moderately distressing in past week        
  0 234 130 1   93 1  
  1 193 123 1.1 (0.8-1.6) 110 1.5 (1.1-2.1)
  ≥2 372 222 1.1 (0.8-1.4) 206 1.5 (1.1-2.0)
  1. aAdjusted for sex and age (in 10-year strata) and ethnicity.
  2. bRisk estimates are for those with the disease relative to those who did not have it.