Table 3.

Fixed effect modeling of changes in BMI and the annual family income per capita between 2010, 2014, and 2018.

	Model 4: Whole sample		Model 5: illiteracy		Model 6: non-illiteracy
	β	95% CI	β	95% CI	β	95% CI
Ln (The annual family income per capita)	0.1614**	0.0325 0.2903	0.2462**	0.05519 0.4372	0.0470	−0.1173 0.2113
Age	0.0357	−0.5257 0.5970	−0.0275	−0.6770 0.6220	1.0642	−0.8962 3.0246
Marital status	0.1061	−0.6935 0.9057	−0.0014	−1.1382 1.1354	0.3011	−0.7952 1.3973
Chronic disease	0.1246	−0.2116 0.4607	0.0252	−0.4806 0.5311	0.2436	−0.1769 0.6640
Intercept	18.4295	−22.5309 59.3897	22.1391	−25.3525 69.6306	−55.2547	−197.8846 87.3751
R2: within	0.0241			0.0237	0.0362

Regression coefficients are unstandardized and unweighted:

^**P < 0.05.