Table 1.

Reporting of Hot Flashes by Sample Characteristics at Annual Visit 6,^a Study of Women's Health Across the Nation, United States, 2002–2003

	Any Hot Flashes (n  = 812; 54%)		No Hot Flashes (n = 773; 49%)		P Value
	No.	Row %	No.	Row %
Siteb
Detroit, Michigan	187	58.4	133	41.6	0.002
Boston, Massachusetts	163	56.2	127	43.8
Chicago, Illinois	103	55.1	84	44.9
Oakland, California	133	43.8	171	56.3
Los Angeles, California	138	44.2	174	55.8
Pittsburgh, Pennsylvania	131	53.3	115	46.8
Race/ethnicityb
African American	311	67.2	152	32.8	<0.0001
Caucasian	375	46.0	440	53.9
Chinese	83	45.1	101	54.9
Japanese	86	43.7	111	56.4
Educationb
Less than college	481	57.1	362	42.9	<0.0001
College or greater	374	45.8	442	54.2
Smokingb
Current	125	59.8	84	40.2	0.01
Past/never	730	50.3	720	49.7
Parityb
No children	126	43.0	167	57.0	0.001
Any children	729	53.4	637	46.6
Menopausal statusb
Premenopausal	20	29.4	48	70.6	<0.0001
Early perimenopausal	229	39.6	350	60.5
Late perimenopausal	129	65.8	67	34.2
Postmenopausal	422	59.1	292	40.9
Indeterminatec	55	53.9	47	46.1
	Mean (SD)		Mean (SD)
Age, yearsd	52.1 (2.6)		51.8 (2.7)		0.008
Anxious symptomsd	6.5 (2.4)		5.8 (1.9)		<0.0001
% Body fatd	39.0 (7.4)		36.9 (8.1)		<0.0001
FSH, mIU/mLd,e	74.5 (49.5)		53.7 (41.6)		<0.0001
Estradiol, pg/mLd,e	42.9 (70.4)		59.3 (83.1)		<0.0001
Free estradiol indexd,e	0.48 (0.95)		0.56 (0.85)		<0.0001

Abbreviations: FSH, follicle-stimulating hormone; SD, standard deviation.

^aData were derived from visit 6 except in the case of missing data at visit 6, when data from the next available visit are presented.

^bDifferences were tested with chi-square tests.

^cWomen previously classified as pre- or perimenopausal who reported hormone use since the last study visit (past year).

^dDifferences were tested with t tests.

^eLog transformed for statistical comparison.