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Table 1 Age distribution of participants in the case-control study

From: Risk of breast cancer and family history of other cancers in first-degree relatives in Chinese women: a case control study

Age groups Cases, n (%) Controls, n (%)
≤ 30 y 17 (2.1%) 17 (2.1%)
31 – 40 y 140 (17.0%) 140 (17.0%)
41 – 50 y 296 (36.0%) 298 (36.2%)
51 – 60 y 235 (28.6%) 233 (28.3%)
61 – 70 y 96 (11.7%) 93 (11.3%)
71 – 80 y 36 (4.4%) 39 (4.7%)
≥ 81 y 3 (0.4%) 3 (0.4%)
Total 823 (100%) 823 (100%)
Median 49 y 49 y
SD 10.82 y 10.82 y