Table 1. Factors associated with NBNA score.

		NBNA Score		Low NBNA*
		ß (95%CI)	p-value	OR(95%CI)	p-value
Lg Mn quartiles
<P25(Mn<2.7 µg/L)		0		1.0
P25-50(Mn: 2.7–4.0 µg/L)		0.1 (−0.1, 0.3)	0.482	1.0 (0.3, 4.1)	0.985
P50-75(Mn: 4.1−9.0 µg/L)		0.0 (−0.2, 0.2)	0.961	1.7 (0.5, 5.9)	0.396
≥P75(Mn≥9.1 µg/L)		−1.2 (−1.4, −1.0)	<0.001	8.0 (2.8, 23.0)	<0.001
Lg Se quartiles
<P25(LgSe<1.7 µg/L)		0		1.0
P25-50(LgSe: 1.7–1.8 µg/L)		0.9 (0.7, 1.1)	<0.001	0.23 (0.14, 0.38)	<0.001
P50-75(LgSe: 1.8–1.9 µg/L)		1.2 (1.0, 1.4)	<0.001	0.10 (0.05, 0.20)	<0.001
≥P75(LgSe≥1.9 µg/L)		1.1 (0.9, 1.4)	<0.001	0.10 (0.05, 0.22)	<0.001
Maternal age (years)		0.0 (−0.1, 0.0)	0.002	1.0 (1.0, 1.1)	0.457
Gestational age (days)		0.0 (0.0, 0.0)	0.265	1.0 (1.0, 1.0)	0.852
Birth weight		0.0(0.0, −0.0)	0.192	1.0 (1.0,1.0)	0.970
Gender
Male		0		1.0
Female		−0.1 (−0.3, 0.1)	0.295	1.1 (0.6, 2.1)	0.687
Household incomes(Yuan/m/per person)
<2000	0			1.0
2000–5000	−0.1 (−0.3, 0.1)		0.407	1.0 (0.5, 2.1)	0.927
>5000	−0.5 (−0.7, −0.2)		<0.001	1.9 (0.9, 4.0)	0.100
Maternal education
Middle school or lower	0			1.0
High scool	−0.1 (−0.4, 0.1)		0.295	1.6 (0.7, 3.9)	0.313
Bachelor degree	−0.2 (−0.3, 0.0)		0.103	1.4 (0.6, 2.9)	0.446
Higher than Bachelor degree	−0.7 (−1.1, −0.3)		0.001	4.9 (1.7, 14.0)	0.003
Paternal education
Middle school or lower	0			1.0
High scool	0.1 (−0.2, 0.3)		0.579	0.9 (0.3, 2.6)	0.805
Bachelor degree	−0.3 (−0.5, −0.1)		0.006	1.7 (0.8, 3.8)	0.175
Higher than Bachelor degree	−0.5 (−0.9, −0.2)		0.004	4.6 (1.6, 13.0)	0.004
Maternal occupation
White collar	0			1.0
Technician	0.0 (−0.3, 0.3)		0.912	1.2 (0.4, 3.8)	0.793
Blue collar	−0.2 (−0.4, 0.1)		0.133	1.7 (0.6, 4.5)	0.313
Housewife	−0.6 (−1.3, 0.2)		0.175	3.3 (0.3, 31.0)	0.302
Paternal occupation
White collar	0			1.0
Technician	0.3 (0.0, 0.6)		0.032	0.7 (0.2, 2.3)	0.522
Blue collar	0.1 (−0.1, 0.3)		0.467	1.0 (0.5, 2.2)	0.999
Unemployed	−0.2 (−0.6, 0.2)		0.265	1.3 (0.4, 4.6)	0.700

^*low NBNA: NBNA Score<37.