Table 2.

Estimated models for BMI, FFMI, FMI, and WC on gender, race, and age, Project HeartBeat! 1991–1995

	BMI		FFMI		FMI		WC
Parameter	Estimate	SE	Estimate	SE	Estimate	SE	Estimate	SE
Fixed parameters
Constant	19.62	0.2561	15.10	0.117	4.565	0.160	68.11	0.560
Gender (0, male; 1, female)	0.0206ns	0.3651	−0.671	0.166	0.577	0.229	−3.041	0.799
Race (0, nonblack; 1 black)	0.9153ns	0.5677	0.812	0.252	−0.220ns	0.366	−0.148ns	1.249
Gender × race	2.167	0.7664	0.773	0.327	1.372	0.518	5.551	1.695
Age(years)a	0.7491	0.0488	0.877	0.031	−0.141	0.037	2.555	0.115
Age2	—	0.00728	0.036	0.005	−0.030	0.006	−0.007ns	0.018
Age3	—	0.00163	−0.010	0.001	0.004	0.001	−0.023	0.004
Gender × age	0.1873	0.0662	−0.194	0.042	0.362	0.050	−0.330	0.157
Gender × age2	−0.0203	0.00994	−0.048	0.007	0.031	0.008	−0.090	0.024
Gender × age3	—	0.00225	0.003	0.001	−0.008	0.002	0.003ns	0.006
Race × age	0.1173ns	0.0892	0.013ns	0.058	0.023ns	0.068	−0.038ns	0.212
Race × age2	—	0.0138	0.015ns	0.009	−0.017ns	0.011	−0.033ns	0.034
Race × age3	0.01053	0.00338	0.006	0.002	0.009	0.003	0.030	0.008
Between-subjects variances/covariance
Constant	17.91	1.004	3.660	0.212	6.727	0.386	84.759	4.803
Age/constant	1.077	0.1184	0.415	0.036	0.026ns	0.047	4.786	0.581
Age	0.3514	0.0239	0.135	0.010	0.149	0.011	1.705	0.124
Within-subjects variance
Error	0.4092	0.00883	0.221	0.005	0.332	0.007	3.010	0.065

FFMI, fat free–mass index; FMI, fat mass index; WC, waist circumference; ns, not significant at the level of ≥0.05

^aAge centered at 12.1 years (mean age of 678 participants)