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Table 1 Cases and controls in Carolina Breast Cancer Study (CBCS) analytic datasets by race

From: Birthweight, parental age, birth order and breast cancer risk in African-American and white women: a population-based case–control study

   African-American White
Analytic dataset Main exposure Cases (%) Controls (%) Cases (%) Controls (%)
CBCS, entire Birth order 335 (100.0) 332 (100.0) 526 (100.0) 458 (100.0)
CBCS, born 1948 or later   131 (39.1) 135 (40.7) 235 (44.7) 181 (39.5)
   Maternal age dataset Birth order, Maternal age 107 (31.9) 116 (34.9) 173 (32.9) 121 (26.4)
   Paternal age dataset Paternal age 95 (28.4) 100 (30.1) 171 (32.5) 118 (25.8)
CBCS, NC born 1949 or later   99 (29.6) 96 (28.9) 112 (21.3) 85 (18.6)
   Birthweight, full dataset Birthweight 86 (25.7) 89 (26.8) 110 (20.9) 78 (17.0)
   Birthweight, restricted dataset Birthweight 49 (14.6) 37 (11.1) 98 (18.6) 63 (13.8)
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