Table 1

Distribution of selected risk factors in German cases and controls and the corresponding odds ratios

Cases (n = 604)PercentageControls (n = 1063)PercentageORa (95% CI)
Parity
 0 full-term pregnancies13121.6922421.071
 1–2 full-term pregnancies41168.0567163.121.08 (0.84–1.40)
 3+ full-term pregnancies6210.2616815.800.65 (0.44–0.94)
Total time of breastfeeding (mo)
 028447.0246743.931
 1–622036.4235333.211.05 (0.83–1.32)
 7+10016.5624322.860.69 (0.52–0.91)
First-degree family history
 No52887.42100494.451
 Yes7612.58595.552.42 (1.69–3.45)
Menarche (yrs)
 ≤1222437.0938836.501
 13–1429248.3450447.410.98 (0.78–1.22)
 15+8514.0717015.990.84 (0.62–1.15)
 Missing30.5010.09
Education
 Low8113.4114713.831
 Medium40567.0566262.271.10 (0.81–1.48)
 High11819.5425423.890.82 (0.57–1.17)
Alcohol consumption (g/day)
 None12019.917316.31
 ≤1839365.179674.90.72 (0.55–0.94)
 19+9115.1948.81.42 (0.97–2.06)
  • a OR, odds ratio; CI, confidence interval.