TABLE 4.

Population ancestry group differences in body-compartment z scores in NHANES participants aged 8–19 y¹

	Males			Females
	LBMI z score	FMI z score	BMI z score	LBMI z score	FMI z score	BMI z score
Non-Hispanic white	−0.07 ± 0.04	0.02 ± 0.04	0.45 ± 0.05	−0.09 ± 0.05	−0.04 ± 0.04	0.45 ± 0.05
Non-Hispanic black	0.26 ± 0.03	−0.27 ± 0.03	0.49 ± 0.03	0.45 ± 0.03	0.04 ± 0.03	0.77 ± 0.03
Mexican American	0.05 ± 0.03	0.26 ± 0.03	0.66 ± 0.04	−0.09 ± 0.04	0.13 ± 0.05	0.56 ± 0.05

¹All values are means ± SEs (all such values); n = 7095. The LBMI z score was higher in non-Hispanic blacks than in non-Hispanic whites (males and females: P < 0.0001) and Mexican Americans (males and females: P < 0.0001) and in Mexican Americans than in non-Hispanic whites (P = 0.04). FMI z score was higher in Mexican Americans than in non-Hispanic whites (males: P < 0.0001; females: P = 0.02) and non-Hispanic blacks (males: P < 0.0001) and in non-Hispanic whites than in non-Hispanic blacks (males: P < 0.0001). BMI z score was higher in Mexican Americans than in non-Hispanic whites and blacks in males (P < 0.01) and higher in non-Hispanic blacks than in whites and Mexican Americans in females (P < 0.01). Chi-square analyses were used to determine significance. FMI, fat mass index; LBMI, lean BMI.