Table 1.

Estimates of the fixed effects and the variance components of the log-gamma and normal random effects models.

Para.	Log-gamma			Normal
	Estimate	SE	p-value	Estimate	SE	p-value
β10	4.0425	0.0623	<0.0001	3.9671	0.0919	<0.0001
β11	−0.0327	0.0153	0.0326	−0.0290	0.0148	0.050
β20	47.7384	0.2876	<0.0001	47.4261	0.4630	<0.0001
β21	−0.5310	0.0297	<0.0001	−0.5746	0.0713	<0.0001
${\sigma }_{b_{i10}}^2$	0.9117	0.0360	<0.0001	1.5998	0.1705	<0.0001
${\sigma }_{b_{i11}}^2$	0.0031	0.0006	<0.0001	0.0104	0.0040	<0.0001
${\sigma }_{b_{i20}}^2$	35.4466	3.2269	<0.0001	41.6805	4.3238	<0.0001
${\sigma }_{b_{i21}}^2$	0.3243	0.0807	<0.0001	0.3948	0.1034	<0.0001
${\sigma }_1^2$	0.2116	0.0083	<0.0001	0.2396	0.0119	<0.0001
${\sigma }_2^2$	2.1999	0.1229	<0.0001	2.4707	0.1778	<0.0001