Table 5.

Distributions of selected basal-like risk factors in African-American and white controls under age 40 and aged 40–49

Characteristica	African-American age <40 (%)	White age <40 (%)	African-American age 40–49 (%)	White age 40–49 (%)
Parity ≥3	24 Pb = 0.45	13	41 P = 0.0001	19
Never breastfed	82 P = 0.01	61	75 P = 0.0003	61
Parity ≥3 and never breastfed	18 P = 0.002	5	30 P < 0.0001	7
Lactation suppressants, ever use	34 P = 0.06	19	61 P = 0.0003	42
Parous women: AFFTP <26	78 P = 0.04	59	86 P < 0.0001	61
Parous women  ≥2 children breastfed	9 P < 0.0001	37	14 P < 0.0001	27
≥4 months breastfeeding per child	9 P < 0.0001	39	10 P < 0.0001	26
WHR ≥0.77	61 P = 0.31	46	80 P < 0.0001	55

^aPercentages in table are adjusted for sampling probabilities

^bChi square test comparing African-American and white controls in each age group, adjusted for sampling probabilities