Table 3.

Results of the mixed model for the log of children’s blood lead concentrations.

Variable	Coefficient	Standard Error	95% Confidence Interval
No use of Pb-glazed ceramics	−0.11	0.02	−0.15, −0.07 ***
Lead in air	0.32	0.07	0.18, 0.44 ***
Child’s age
2 years old	0.11	0.02	0.07, 0.16 ***
3 years old	0.28	0.03	0.21, 0.35 ***
4 years old	0.33	0.05	0.24, 0.42 ***
5 years old	0.19	0.06	0.08, 0.31 ***
Lead in air × child’s age
2 years old	0.09	0.05	−0.01, 0.20 *
3 years old	−0.02	0.09	−0.19, 0.15
4 years old	0.08	0.12	−0.15, 0.31
5 years old	0.49	0.20	0.09, 0.89 **
Year of sample collection	−0.07	0.01	−0.09, −0.05 ***
Cohort
Cohort B	0.17	0.05	0.06, 0.28 **
Cohort C	0.18	0.10	−0.02, 0.37 *
Cohort D	0.27	0.14	−0.00, 0.53 *
Cohort E	0.11	0.22	−0.32, 0.53
Maternal education
Elementary	0.32	0.27	−0.21, 0.86
Technical elementary	0.27	0.27	−0.26, 0.80
Middle school	0.22	0.27	−0.31, 0.75
Technical middle school	0.07	0.27	−0.46, 0.61
Highs school or college	−0.09	0.29	−0.67, 0.47
Sex (female)	−0.03	0.02	−0.07, 0.01

*** p value < 0.001, ** p value < 0.05, * p value < 0.1.