Body size, modifying factors, and postmenopausal breast cancer risk in a multiethnic population: the San Francisco Bay Area Breast Cancer Study

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Table 2 Body size among control women by race/ethnicity

	Hispanics (n = 804)		African Americans (n = 365)		Non-Hispanic Whites (n = 399)		P value^a
	n	%^b	n	%^b	n	%^b
Current BMI (kg/m²) ^c							* †
<25.0	147	18	80	22	185	47
25.0-29.9	310	39	124	34	116	29
≥30.0	342	43	159	44	97	24
Young-adult BMI (kg/m²) ^d,e							* ‡
Q1: ≤20.6	125	17	116	32	130	33
Q2: 20.7-22.4	170	23	83	23	118	30
Q3: 22.5-24.7	210	29	84	23	76	19
Q4: >24.7	225	31	77	21	69	18
Weight gain (kg) ^f							* † ‡
Stable ^g	80	11	31	9	65	18
Gain, 3.0-9.9	176	25	66	19	113	31
Gain, 10.0-19.9	234	33	91	26	96	26
Gain, 20.0-29.9	142	20	83	24	63	17
Gain, ≥30.0	74	11	76	22	34	9
Waist (cm) ^d							* † ‡
Q1: ≤ 82.3	170	22	41	14	150	43
Q2: 82.4-90.5	211	27	65	22	77	22
Q3: 90.6-99.8	196	25	90	30	67	19
Q4: >99.8	195	25	102	34	57	16
Hip (cm) ^d							* † ‡
Q1: ≤ 100.5	206	27	48	16	103	29
Q2: 100.6-107.5	186	24	60	20	107	31
Q3: 107.6-116.2	183	24	85	29	87	25
Q4: >116.2	196	25	105	35	54	15
Waist-to-hip ratio (WHR) ^d							* † ‡
Q1: ≤ 0.79	172	22	52	18	163	46
Q2: 0.80-0.84	224	29	70	24	83	24
Q3: 0.85-0.88	190	25	83	28	53	15
Q4: >0.88	185	24	92	31	52	15
Waist-to-height ratio (WHtR) ^d							* †
Q1: ≤ 0.52	138	18	56	19	162	46
Q2: 0.53-0.58	195	25	78	26	82	23
Q3: 0.59-0.64	216	28	81	27	58	17
Q4: >0.64	223	29	83	28	49	14

Abbreviation: BMI, body mass index.
^a Chi-square test for the difference between race/ethnicity; * = P <0.05 between non-Hispanic Whites and Hispanics; † = P <0.05 between non-Hispanic Whites and African Americans; ‡ = P <0.05 between Hispanics and African Americans.
^b Percentages may not add up to 100% due to rounding.
^c Based on self-reported adult weight and measured height at interview (if not available, then based on measured weight at interview and/or self-reported adult height).
^d Based on quartiles among all postmenopausal controls.
^e Based on self-reported young-adult weight and measured height at interview (or self-reported adult height when measured height not available).
^f Self-reported adult weight (or measured weight at interview if self-reported weight not available) minus self-reported young-adult weight; excludes 64 controls who lost >3 kg of weight.
^g Stable weight defined as +/- 3 kg.