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Table 4 Associations stratified by time from inclusion to diagnosis of primary Sjögren’s syndrome

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

   Time period ≤8.2 years (n = 32)
OR (95% CI)
Exposed (cases/controls) Time period >8.2 years (n = 31)
OR (95% CI)
Exposed (cases/controls)
Smoking Not current smokers Reference 27/87 Reference 23/72
Current smokers 0.3 (0.1–0.9) 4/40 0.3 (0.1–0.8) 6/52
Never smokers Reference 11/58 Reference 7/38
Former smokers 4.9 (1.6–15.2) 16/29 3.4 (1.1–10.8) 16/34
Current smokers 0.5 (0.1–1.8) 4/40 0.5 (0.1–2.0) 6/52
Socioeconomic status White-collar worker Reference 13/65 Reference 13/66
Blue-collar worker 1.4 (0.5–3.8) 11/51 1.3 (0.5–3.7) 11/38
Other 2.0 (0.3–14.3) 2/6 2.6 (0.5–14.4) 4/10
Education Medium/high Reference 18/74 Reference 15/70
Low 1.1 (0.4–2.5) 13/53 1.1 (0.4–3.2) 12/46
  1. Relationship between smoking, socioeconomic status and level of formal education stratified by time from inclusion in the health surveys to diagnosis of primary Sjögren’s syndrome