Table 3.

Association between RTL and breast cancer risk

RTLCases, n (%)Controls, n (%)OR (95% CI)*OR (95% CI)
4th quartile221 (24.7)223 (24.3)1.001.00
3rd quartile209 (23.3)228 (24.9)0.95 (0.70-1.28)0.95 (0.69-1.30)
2nd quartile243 (27.1)235 (25.6)1.14 (0.81-1.59)1.16 (0.81-1.65)
1st quartile223 (24.9)231 (25.2)1.17 (0.80-1.73)1.25 (0.83-1.88)
Ptrend = 0.32Ptrend = 0.20
Above median430 (48.0)451 (49.2)1.001.00
Below median466 (52.0)466 (50.8)1.19 (0.93-1.53)1.23 (0.94-1.60)
  • Abbreviations: OR, odds ratio; CI, confidence interval.

  • * Odds ratios and 95% confidence intervals from conditional logistic regression analysis adjusted for matching factors (age, fasting status, recent postmenopausal hormone use, date and time of blood draw).

  • Odds ratios and 95% confidence intervals from conditional logistic regression additionally adjusted for smoking status at blood draw, age at menarche, BMI at blood draw, weight gain from age 18 y until blood draw, age at first birth and parity, family history of breast cancer, history of benign breast disease, age at menopause, duration of postmenopausal hormone use.