Trajectories of Change in Obesity among Tehranian Families: Multilevel Latent Growth Curve Modeling

Table 2

Model fit indices in the model building process for body mass index, waist circumference, and a body shape index.

Index	Strategy step	Model	(df)	RMSEA	CFI	NNFI	SRMR	SRMR
							(Within)	(Between)
BMI (kg/m^2)	Step	Model 1	624.034 (5)	0.08	0.989	0.987	0.021	—
	Step	Model 2	365.101 (8)	0.048	0.974	0.961	0.004	0.02
		Model 3	4908.012 (8)	0.177	0.897	0.821	0.053	0.028
	Step	Model 4	367.991 (29)	0.043	0.984	0.982	0.005	0.008
WC (cm)	Step	Model 1	1569.793 (5)	0.127	0.965	0.958	0.079	—
	Step	Model 2	522.656 (8)	0.078	0.962	0.962	0.004	0.042
		Model 3	1202.674 (8)	0.088	0.945	0.912	0.009	0.047
	Step	Model 4	953.432 (29)	0.051	0.975	0.961	0.002	0.023
ABSI	Step	Model 1	615.242 (5)	0.079	0.676	0.612	0.236	—
	Step	Model 2	266.883 (8)	0.073	0.99	0.834	0.042	0.104
		Model 3	989.57 (8)	0.079	0.608	0.563	0.06	0.107
	Step	Model 4	859.456 (29)	0.048	0.859	0.884	0.011	0.052

Model 1: unconditional LGCM; model 2: unconditional linear MLGCM; model 3: unconditional quadratic MLGCM; model 4: conditional linear MLGCM
All  
Residual variances are equal across time, and, on level 3, residual variances are fixed at zero.
ABSI, a body shape index; BMI, body mass index; CFI, confirmatory fit index; LGCM, latent growth curve modeling; MLGCM, multilevel latent growth curve modeling; NNFI, nonnormed fit index; RMSEA, root mean square error of approximation; SRMR, standardized root mean square residual; WC, waist circumference; , chi-square random variable.