a significant trendP = 0.0265
A higher age at menarche was associated with a reduced risk of breast cancer (OR = 0.88, 95% CI: 0.78–0.98 for ≥14 years as compared to ≤11 years), with a significant trend of decrease in risk ( P = 0.0265).
A higher age at menarche was associated with a reduced risk of breast cancer (OR = 0.88, 95% CI: 0.78–0.98 for ≥14 years as compared to ≤11 years), with a significant trend of decrease in risk ( P = 0.0265).