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Table 4 Risk of non-Hodgkin lymphoma for smoking habits in selected strata

From: The dose-response relationship between tobacco smoking and the risk of lymphomas: a case-control study

  Smoking habitsa χ2 for trend
Neverb Current < 15 cig/day Current ≥ 15 cig/day
Ca:Co Ca:Co OR 95% CI Ca:Co OR 95% CI
Study center
 Aviano 133:250 33:68 1.08 (0.70–1.68) 30:45 1.56 (0.95–2.56) p = 0.57
 Napoli 72:128 35:53 1.17 (0.71–1.93) 53:60 1.75 (1.07–2.85) p = 0.02
 Catania 34:48 10:20 0.52 (0.23–1.19) 25:34 1.03 (0.51–2.06) p = 0.68
      χ2 for heterogeneity p = 0.39
Gender
 Male 84:186 39:83 1.14 (0.75–1.75) 80:119 1.68 (1.16–2.43) p = 0.15
 Female 155:240 39:58 0.98 (0.63–1.51) 28:20 1.67 (0.91–3.07) p = 0.06
      χ2 for heterogeneity p = 0.50
Age (years)
  < 45 66:152 22:63 1.11 (0.70–1.76) 34:49 2.33 (1.39–3.89) p = 0.01
 45–64 95:136 41:52 0.96 (0.59–1.57) 57:66 1.33 (0.84–2.10) p = 0.47
  ≥ 65 78:138 15:26 1.20 (0.57–2.51) 17:24 1.31 (0.61–2.80) p = 0.64
      χ2 for heterogeneity p = 0.46
  1. Odds ratios (OR) and 95% Confidence Intervals (CI) were estimated using unconditional logistic regression models adjusted for gender, age, study center, years of education, and place of birth. Ca, cases; Co, controls
  2. aFormer smokers excluded
  3. bReference category