Non-Hodgkin lymphoma | Hodgkin lymphoma | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Controls (n = 1004) | Cases (n = 571) | OR (95% CI) | Controls (n = 188) | Cases (n = 188) | OR (95% CI) | |||||
No. | % | No. | % | No. | % | No. | % | |||
Smoking status | ||||||||||
Never | 426 | 42.4 | 239 | 41.9 | 1c | 89 | 47.3 | 85 | 45.2 | 1c |
Former | 296 | 29.5 | 146 | 25.6 | 0.91 (0.68–1.20) | 33 | 17.6 | 23 | 12.2 | 0.83 (0.43–1.63) |
Current | 282 | 28.1 | 186 | 32.6 | 1.18 (0.91–1.54) | 66 | 35.1 | 80 | 42.6 | 1.50 (0.93–2.44) |
Current | ||||||||||
Smoking intensity (cig/day)a | ||||||||||
< 15 | 141 | 14.0 | 78 | 13.7 | 0.99 (0.71–1.39) | 40 | 21.3 | 36 | 19.2 | 1.07 (0.61–1.88) |
≥ 15 | 139 | 13.8 | 108 | 18.9 | 1.42 (1.02–1.97) | 26 | 13.8 | 43 | 22.9 | 2.47 (1.25–4.87) |
χ2 for trend | p = 0.04 | p = 0.02 | ||||||||
Increase of 5 cig/day | 1.07 (1.00–1.15) | 1.28 (1.11–1.49) | ||||||||
Smoking duration (years)a, b | ||||||||||
< 30 | 131 | 13.1 | 80 | 14.0 | 1.38 (0.96–1.99) | 34 | 18.1 | 33 | 17.6 | 1.03 (0.55–1.93) |
≥ 30 | 151 | 15.0 | 105 | 18.4 | 1.04 (0.75–1.44) | 32 | 17.0 | 47 | 25.0 | 2.15 (1.16–3.99) |
χ2 for trend | p = 0.46 | p = 0.03 | ||||||||
Age at starting (years)a | ||||||||||
≥ 18 | 130 | 13.0 | 75 | 13.1 | 1.00 (0.71–1.41) | 24 | 12.8 | 25 | 13.3 | 1.35 (0.69–2.62) |
< 18 | 151 | 15.0 | 110 | 19.3 | 1.36 (0.99–1.88) | 42 | 22.3 | 55 | 29.3 | 1.60 (0.93–2.77) |
χ2 for trend | p = 0.07 | p = 0.10 | ||||||||
Former | ||||||||||
Smoking intensity (cig/day)a | ||||||||||
< 15 | 139 | 13.9 | 69 | 12.1 | 0.93 (0.66–1.31) | 16 | 8.5 | 9 | 4.8 | 0.72 (0.29–1.80) |
≥ 15 | 156 | 15.6 | 77 | 13.5 | 0.91 (0.64–1.29) | 17 | 9.0 | 14 | 7.5 | 1.07 (0.46–2.51) |
χ2 for trend | p = 0.42 | p = 0.49 | ||||||||
Increase of 5 cig/day | 0.99 (0.92–1.06) | 1.02 (0.83–1.24) | ||||||||
Smoking duration (years)a, b | ||||||||||
< 30 | 168 | 16.7 | 86 | 15.1 | 0.95 (0.69–1.31) | 12 | 6.4 | 14 | 7.5 | 1.56 (0.66–3.72) |
≥ 30 | 127 | 12.7 | 60 | 10.5 | 0.85 (0.58–1.25) | 20 | 10.6 | 9 | 4.8 | 0.44 (0.17–1.13) |
χ2 for trend | p = 0.34 | p = 0.83 | ||||||||
Age at starting (years)a | ||||||||||
≥ 18 | 155 | 15.5 | 78 | 13.7 | 0.91 (0.65–1.28) | 16 | 8.6 | 8 | 4.3 | 0.53 (0.19–1.46) |
< 18 | 139 | 13.9 | 65 | 11.4 | 0.87 (0.61–1.26) | 16 | 8.6 | 15 | 8.0 | 1.17 (0.52–2.62) |
χ2 for trend | p = 0.36 | p = 0.49 | ||||||||
Time since quitting (years)a | ||||||||||
≥ 16 | 153 | 15.3 | 76 | 13.4 | 0.91 (0.64–1.30) | 12 | 6.5 | 9 | 4.8 | 1.39 (0.47–4.11) |
< 16 | 140 | 14.0 | 67 | 11.8 | 0.86 (0.60–1.23) | 19 | 10.2 | 13 | 7.0 | 1.10 (0.47–2.53) |
χ2 for trend | p = 0.39 | p = 0.75 |