表 4.

日均饮奶份数与家庭社会经济状况和儿童青少年BMI z评分的关系

Mediating effect of the daily milk intake in the association between family SES and BMI z-score of children and adolescents

Items	a	P	b	P	c'	P	ab	95%CI	ab/(c′+ab)
All of linear regressions adjusted the age, gender, urban and rural area, respectively. BMI, body mass index; SES, socio-economic status.
Parents’ education	0.07	0.003	-0.07	0.045	0.13	0.001	-0.005	-0.012, -0.001	-3.63%
Household income	0.06	0.002	-0.07	0.052	0.07	0.028	-0.004	-0.010, -0.001	-5.86%