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