Table 2.

Univariate ANCOVA Examining the Effects of Sex, Race, and Pubertal Status on Parameters of Lipolysis Estimated From the IM-FSIGT (n = 35 Boys and 77 Girls)^a

Variable entered	Insulin-Suppressed Lipolysis Rate (l2)			Maximum Lipolysis Rate (l0 + l2)			[Insulin] for 50% Suppression of Lipolysis (ED50)			Fatty Acid Clearance Rate Constant (cf)
	β	SE	P	β	SE	P	β	SE	P	β	SE	P
Model with FM
Sex	1.32	1.79	.46	1.30	1.80	.47	1.12	2.77	.68	0.02	0.01	.02
Race	−1.06	1.47	.47	−1.10	1.48	.46	0.89	2.27	.69	−0.40c	0.70c	.57
Pubertal status	4.82	2.04	.02	4.72	2.04	.02	2.23	3.14	.48	−0.01	0.01	.41
Height	0.07	0.09	.44	0.07	0.09	.43	0.18	0.14	.20	0.02c	0.04c	.64
Age	−1.51	0.56	.01	−1.51	0.56	.01	−1.00	0.86	.25	−0.22c	0.27c	.43
FM	0.10	0.08	.24	0.09	0.08	.26	0.21	0.13	.10	−0.08c	0.04c	.04
P value for model with FM			.03			.03			.35			.03
Model with LBM
Sex	1.52	1.99	.44	1.46	2.00	.47	0.02	0.04	.54	0.40c	0.88c	.65
Race	−1.15	1.57	.46	−1.16	1.57	.46	0.01	0.03	.72	0.63c	0.70c	.36
Pubertal status	4.74	2.11	.03	4.67	2.12	.03	0.02	0.04	.63	0.31c	0.93c	.74
Height	0.64	0.11	.57	0.07	0.11	.55	0.14c	0.21c	.50	6.01d	4.92d	.00
Age	−1.55	0.58	.01	−1.54	0.58	.01	−0.02	0.01	.13	4.88d	0.25c	.85
% FM	0.20	0.19	.30	0.20	0.19	.31	0.48c	0.36c	.13	0.14c	8.47d	.47
LBM	0.10	0.11	.39	0.09	0.11	.44	0.33c	0.21c	.12	−0.24c	5.02d	.00
P value for model with LBM			.04			.05			.29			.00
Model with REE
Sex	3.72	1.88	.05	3.71	1.89	.05	0.68	0.03	.05	0.02	0.01	.09
Race	−1.12	1.46	.44	−1.16	1.46	.43	0.02	0.03	.38	−0.48c	0.01	.51
Pubertal status	4.54	1.97	.02	4.43	1.98	.03	0.01	0.04	.73	−0.55c	0.01	.58
Height	0.04	0.09	.66	0.04	0.09	.65	0.10c	0.17c	.56	3.59d	4.65d	.44
Age	−1.12	0.55	.05	−1.11	0.55	.05	−0.56	0.01	.58	−0.38c	0.27c	.17
FM	−0.04	0.09	.64	−0.05	0.09	.61	−8.16d	0.17c	.64	−2.65d	4.70d	.57
REE	0.01	0.30c	.01	0.01	0.30c	.00	2.34d	0.65d	.00	−0.28d	0.17d	.11
P value for model with REE			.00			.00			.02			.02
Model with FM and VAT
Sex	1.77	1.81	.33	1.79	1.81	.32	1.54	2.81	.58	0.02	0.01	.04
Race	−0.26	1.55	.86	−0.23	1.55	.88	1.58	2.40	.51	−0.01	0.01	.21
Pubertal status	5.74	2.11	.01	5.72	2.11	.01	3.08	3.29	.35	−0.01	0.01	.16
Height	0.10	0.09	.30	0.10	0.09	.29	0.20	0.14	.16	0.45d	4.40d	.92
Age	−1.58	0.56	.01	−1.58	0.56	.00	−1.06	0.86	.22	−0.17c	0.26c	.53
FM	0.03	0.09	.76	0.02	0.09	.85	0.15	0.14	.30	−3.52c	4.38d	.42
VATb	6.07	3.92	.12	6.64	3.93	.09	5.37	6.10	.38	−0.04	0.02	.04
P value for model with VAT			.02			.02			.38			.01

Abbreviations: β, parameter estimate; FFM, fat-free mass.

^aPositive β indicates higher for girls and higher for NHW; bold text indicates significant effects (P < .05). For ANCOVA, pubertal status was divided into early (Tanner 1–3 breast development for girls; testis volume <12 mL for boys) and late (Tanner 4–5 breast development for girls; testis volume ≥12 mL for boys) groups.

^bFor ANCOVA, VAT was log transformed to meet the homogeneity of variance assumption.

^c× 10⁻².

^d× 10⁻⁴.