. Author manuscript; available in PMC: 2019 Jul 25.

Published in final edited form as: Asian Popul Stud. 2015 May 29;11(2):134–148. doi: 10.1080/17441730.2015.1038873

Table 2.

Growth curve models of BMI trajectories of children and youth in China: 1993-2006

	Model 1		Model 2		Model 3
	Coefficient	S.E.	Coefficient	S.E.	Coefficient	S.E.
Level-1 intercept
Age	−0.408	0.043^***	−0.391	0.043^***	0.130	0.135
Age square	0.031	0.002^***	0.031	0.002^***	0.010	0.006
Waves of survey (the wave of 1993 as the reference group)
The 1997 wave	0.345	0.104^**	0.342	0.102^**	0.355	0.102^***
The 2000 wave	0.785	0.154^***	0.731	0.149^***	0.727	0.149^***
The 2004 wave	1.124	0.259^***	1.063	0.251^***	1.035	0.251^***
The 2006 wave	0.340	0.347	0.275	0.338	0.220	0.338
Male			0.204	0.086^*	0.917	0.343^**
High-income families			0.315	0.115^**	−1.413	0.460^**
Parental years of schooling			−0.034	0.015^*	0.108	0.060
Urban China			0.168	0.117	−1.097	0.472^*
Southern China			−0.585	0.102^***	1.401	0.406^**
Eastern & Middle China			0.577	0.106^***	1.396	0.429^**
Intercept	16.909	0.201^***	16.829	0.265^***	14.118	0.693
Level-1 slope
Male					−0.124	0.068
High-income families					0.290	0.091^**
Parental years of schooling					−0.031	0.012^**
Urban China					0.269	0.094^**
Southern China					−0.364	0.082^***
Eastern & Middle China					−0.145	0.085
Level-1 acceleration
Male					0.004	0.003
High-income families					−0.009	0.004^*
Parental years of schooling					0.001	0.001^**
Urban China					−0.012	0.004^**
Southern China					0.013	0.004^***
Eastern & Middle China					0.005	0.004^***
τ₁₁ (age)	0.278	0.062^***	0.284	0.063^***	0.221	0.060^***
τ₂₂ (age square)	0.001	0.000^***	0.001	0.000^***	0.001	0.000^***
τ₀₀ (intercept)	3.944	1.434^***	4.581	1.472^***	3.079	1.371^***
τ₂₁ (age, age square)	−0.012	0.003^***	−0.012	0.003^***	−0.010	0.003^***
τ₁₀ (age, intercept)	−0.918	0.293^**	−1.025	0.298^***	−0.723	0.281^*
τ₂₀ (age square, intercept)	0.038	0.013^**	0.042	0.013^**	0.031	0.012^*
$σ_{ε}^{2}$ (residual)	3.284	0.116^***	3.295	0.117^***	3.310	0.117^***

Note: Statistical significance:

p < 0.05;

^**

p<0.01;

^***

p<0.001 (two-tailed tests);

For the Model 1 in Table 1, the unexplained variance σ² is 4.394 (.111) in the absence of random effects in slope and acceleration and 6.454 (.133) in the absence of any random effects.