Table 1:

Sociodemographic, health, and body composition characteristics of the analytical sample of adolescents 12–19 yrs (n=3,810), NHANES 2003–2006

Variable	Count (%)	TLR mean ± SE	p-value*
Full sample	3,810 (100%)	97.6 ± 0.7	-
Sex
Boys	1985 (52.0%)	98.1 ± 1.0	Ref
Girls	1825 (48.0%)	97.1 ± 0.9	0.44
Race/Ethnicity
Non-Hispanic White	1042 (64.5%)	97.7 ± 1.0	Ref
Mexican American	1161 (10.7%)	106.2 ± 1.3	<0.001
Non-Hispanic Black	1334 (14.7%)	90.0 ± 0.8	<0.001
Other	273 (10.1%)	99.2 ± 2.4	0.56
PIR
< 130%	1577 (28.6%)	101.1 ± 1.3	<0.001
130–300%	1174 (29.6%)	99.6 ± 1.3	0.002
> 300%	1059 (41.8%)	93.8 ± 1.0	Ref
Weight Status
Underweight	86 (2.9%)	88.0 ± 3.4	0.95
Normal Weight	2249 (60.8%)	88.2 ± 0.7	Ref
Overweight	649 (17.3%)	106.1 ± 1.7	<0.001
Obese	826 (19.0%)	121.5 ± 1.2	<0.001
Menarche (girls only)
Pre-Menarche	125 (8.3%)	84.7 ± 2.3	<0.001
Post-Menarche	1700 (91.7%)	98.2 ± 1.0	Ref

^*P-values were calculated using independent t-tests comparing each variable sub-level to the reference category, indicated by “Ref”. Abbreviations: TLR, truncal-to-leg fat ratio; PIR, poverty income ratio