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Table 2 Demographic and exposure information in pre-primary Sjögren's syndrome cases and controls

From: Cigarette smoking and the risk of primary Sjögren’s syndrome: a nested case control study

  Cases (n = 63) Controls (n = 252) P value**
Female sex, n (%) 58/63 (92) 232/252 (92) 1.00
Age at inclusion in the population survey, mean (IQR), years 52.6 (49.0–56.0) 52.7 (49.0–56.0) 0.94
Current smoker, n (%a) 10/60 (17) 92/251 (37) 0.003
Former smoker, n (%a) 32/60 (53) 63/251 (25) < 0.001
Never smoker, n (%a) 18/60 (30) 96/251 (38) 0.23
White-collar worker, n (%a) 26/54 (48) 131/236 (56) 0.33
Blue-collar worker, n (%a) 22/54 (41) 89/236 (38) 0.68
Other socioeconomic status, n (%a) 6/54 (11) 16/236 (7) 0.28
Low level of formal education, n (%a) 25/58 (43) 99/243 (41) 0.73
Medium/high level of formal education, n (%a) 33/58 (57) 144/243 (59) 0.73
  1. aPercentage of individuals with available data. **Mann-Whitney U test