Table 2.

Association between the number of filling surfaces with resin-based restorative materials and the creatinine-adjusted BPA concentrations in urine

	Model I		Model II
	Beta coefficient	P value	Beta coefficient	P value
Surfaces with resin fillings
0	Reference		Reference
1–5	−0.65	0.11	−0.65	0.12
6–10	−0.43	0.54	−0.34	0.63
11+	1.02	0.51	1.02	0.52
Gender
Boy			Reference
Girl			−0.32	0.43
Age			0.04	0.90
Surfaces with sealants
0	Reference		Reference
1–5	0.22	0.56	0.20	0.62
6–10	−0.63	0.17	−0.59	0.21
11+	9.13	<0.01	9.10	<0.01
Gender
Boy			Reference
Girl			−2.29	0.46
Age			0.35	0.95
Surfaces with resin composites*
0	Reference		Reference
1–5	0.06	0.88	0.01	0.97
6–10	−0.49	0.25	−0.45	0.31
11+	2.68	<0.01	2.67	<0.01
Gender
Boy			Reference
Girl			−0.29	0.47
Age			0.01	0.98

Unit: μg/g creatinine. Significant values are shown in bold (P < 0.01).

^*Resin composites included both resins and sealants.