Table 3: Bivariate linear regression models to evaluate associations between biochemical markers of renal function with some demographic variables,

with kidney biomarkers and with blood lead levels.

	β	P	95% CI
BUN levels
Anemia	-2.57	0.006	-4.42 - 0.724
Creatinine levels	13.91	0.000	9.79 - 18.02
Uric acid levels	0.694	0.004	0.225 - 1.164
Abnormal creatinine levels
Gender	-0.212	0.000	-0.260 - 0.165
BMI	-0.003	0.023	-0.006 - 0.0005
BUN levels	0.005	0.000	0.002 - 0.008
Uric acid levels	0.055	0.000	0.040 - 0.070
Abnormal uric acid levels
Gender	-0.175	0.000	-0.223 -0.127
Age (years)	-0.002	0.028	-0.005 -0.0002
BMI	0.003	0.018	0.0005 - 0.006
Years of work	0.003	0.049	0.007 - 0.101
Creatinine levels	0.364	0.000	0.226 - 0.502
BLL baseline sample	0.002	0.001	0.0009 - 0.003
Highest BLL	0.002	0.002	0.0007 - 0.003
eGFR
Baseline BLL	-0.005	0.000	-0.008 -0.003
Highest BLL	-0.005	0.000	-0.007 -0.003