Table 4.
Odds ratio (OR) for cases and controls in relation to quartiles selenium intake as compared to the first quartile and a merge of quartile 2 and 3, overall and stratified for smoking habits
| Quartile | Mediana (ug/day) | Never smoker | Current smoker | Ex-smoker | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cases/ controls |
Crude OR (95 CIb) | Adjustedc OR (95 CI) | Cases/ controls |
Crude OR (95 CI) | Adjustedc OR (95 CI) | Cases/ controls |
Crude OR (95 CI) | Adjustedc OR (95 CI) | ||
| 1 | 25.2 | 136/135 | 1.00 | 1.00 | 103/68 | 1.00 | 1.00 | 80/71 | 1.00 | 1.00 |
| 2 | 30.9 | 122/140 | 0.87 (0.62–1.22) | 0.98 (0.68–1.42) | 69/88 | 0.52 (0.33–0.80) | 0.57 (0.35–0.94) | 89/85 | 0.93 (0.60–1.44) | 1.21 (0.74–1.99) |
| 3 | 39.4 | 125/128 | 0.97 (0.69–1.37) | 1.01 (0.69–1.46) | 75/95 | 0.52 (0.34–0.80) | 0.54 (0.33–0.88) | 87/82 | 0.92 (0.61–1.46) | 1.27 (0.77–2.08) |
| 4 | 73.9 | 113/128 | 0.88 (0.62–1.24) | 1.01 (0.69–1.48) | 85/63 | 0.89 (0.57–1.39) | 0.92 (0.55–1.53) | 102/102 | 0.89 (0.58–1.35) | 1.06 (0.66–1.70) |
| 1 | 25.2 | 136/135 | 1.09 (0.81–1.47) | 1.01 (0.73–1.39) | 103/68 | 1.93 (1.32–2.80) | 1.81 (1.18–2.77) | 80/71 | 1.07 (0.73–1.57) | 0.81 (0.52–1.25) |
| 2 + 3 | 35.0 | 247/268 | 1.00 | 1.00 | 144/183 | 1.00 | 1.00 | 176/167 | 1.00 | 1.00 |
| 4 | 73.9 | 125/128 | 0.96 (0.71–1.30) | 1.01 (0.73–1.42) | 75/95 | 1.72 (1.16–2.54) | 1.65 (1.06–2.58) | 87/82 | 0.95 (0.67–1.34) | 0.86 (0.58–1.26) |
aResiduals of selenium intake quartiles are presented as the median of total dietary intake of selenium
bConfidence interval
cAdjusted for age, socioeconomic index, education, marriage, number of children, age at first childbirth, age at menarche, use of oral contraceptives, hormone replacement therapy, menopausal status, oophorectomy, body mass index, alcohol consumption, season and year of inclusion. One control was missing smoking data