TABLE 1.

Characteristics of the three study population by body mass index (BMI) categories¹²³⁴

	NHANES III (N=845)					NHANES 2001–2004 (N=2,458)						NHIS 2000 (4,789)
Variable	BMI <25	BMI 25–30	BMI 30+	P	Variable	BMI <25	BMI 25–30	BMI 30–35	BMI 35+	3P	Variable	BMI <25	BMI 25–30	BMI 30+	P
Non-Hispanic Whites (%)	77	84	83	<0.0001	Non-Hispanic Whites (%)	74	81	82	81	<0.0001	Whites (%)	84	86	85	<0.0001
Non-Hispanic Blacks (%)	8	8	6		Non-Hispanic Blacks (%)	11	7	8	11		Blacks or African-American (%)	8	9	10
Mexican-Americans (%)	2	4	5		Mexican-Americans (%)	5	5	5	4		Mexican-American, Hispanic and other races (%)	8	5	5
Other races (%)	13	4	6		Other races	10	7	5	4
Age (years)	56 (.69)	57 (.66)	55 (.82)	0.2538	Age (years)	56 (.50)	55 (.34)	54 (.47)	54 (.65)	0.0095	Age (years)	60 (.35)	58 (.25)	56 (.32)	<0.0001
BMI (kg/m2)	23 (.10)	27 (.08)	33 (.32)	<0.0001	BMI (kg/m2)	23 (.07)	28 (.04)	32 (.06)	39 (.34)	<0.0001	BMI (kg/m2)	23 (.04)	27 (.03)	34 (.12)	<0.0001
Waist circumference (cm)	88 (.36)	100 (.31)	114 (.81)	<0.0001	Waist circumference (cm)	88 (.29)	101 (.20)	112 (.27)	129 (.76)	<0.0001	n/a
Testosterone ng/ml	5.3 (.11)	4.5 (.09)	4 (.10)	<0.0001	PSA > 4ng/ml (% of men)	8	7	4	3	<0.0001	Ever had PSA (%)	66	67	69	0.24

¹Population-specific sample weights were applied in all the analyses to account for individual selection probabilities, non-response and post-stratification that resulted from the complex survey design

²Data represents weighted percentages for categorical variables and means (SE) for continuous variables

³P-values for general association were generated by using analysis of variance

⁴BMI categories were reassigned for each racial subgroup for all racial subgroup analyses