Table 1.

Maternal and child characteristics according to median (M) and 25–75 percentiles (25–75%) BPA concentrations in maternal urine; and percentage of children with an ADHD- or ASD- score above the 75th percentile at 2 or 5 years of age

Maternal and child characteristics	N (%)	BPA ng/mL M (25–75%)	ASD-score > 75% 2 years Percent	ASD-score > 75% 5 years Percent	ADHD-score > 75% 5 years Percent
	658 (100)	1.2 (0.5–2.6)
Parity
Nulliparous	371 (56)	1.37 (0.47–2.88)	32	42	29
Multiparous	287 (44)	1.20 (0.49–2.26)	18	24	22
P-valuea		0.07	< 0.001*	< 0.001*	0.08
Pre-pregnancy BMI (kg/m2)
> 18.5- < 25	412 (62)	1.03 (0.30–2.32)	27	32	24
25–30	169 (26)	1.82 (0.90–2.77)	24	33	28
> 30	77 (12)	1.17 (0.55–2.97)	24	49	33
P-valuea		0.002*	0.65	0.06	0.35
Smoking
No	639 (97)	1.23 (0.47–2.54)	25	32	25
Yes	19 (3)	1.21 (0.63–2.68)	37	73	33
P-valuea		0.19	0.29	0.001*	0.49
Education b
high school or less	177 (27)	1.53 (0.55–2.66)	32	54	39
high school + 1–4 years	336 (53)	1.20 (0.49–2.73)	25	29	22
high school + > 4 years	131 (20)	1.35 (0.33–2.24)	18	21	18
P-valuea		0.34	0.04*	< 0.001*	< 0.001*
Age
< 25	61 (9)	1.08 (0.39–3.34)	40	35	44
25–34	438 (67)	1.23 (0.47–2.49)	26	35	25
> 34	159 (24)	1.28 (0.55–2.52)	19	30	21
P-valuea		0.82	0.006*	0.06	0.03*
Psychiatric predisposition
None	565 (86)	1.27 (0.50–2.52)	24	33	24
Predisposition from parents	93 (14)	1.14 (0.38–2.97)	36	42	33
P-valuea		0.88	0.01*	0.16	0.14
Birth weight (gram)
≤ 3560	332 (51)	1.24 (0.44–2.89)	27	42	27
> 3560	326 (49)	1.23 (0.52–2.38)	25	26	24
P-valuea		0.13	0.52	< 0.001*	0.5
Exclusive breastfeeding (weeks)c
0	101 (16)	1.96 (0.79–3.72)	23	45	36
1–12	256 (42)	1.20 (0.47–2.38)	25	34	31
> 12	259 (42)	1.24 (0.41–2.42)	27	32	18
P-valuea		0.22	0.65	0.18	0.005*
Gestation
< 37 + 0	24 (4)	0.54 (0.00–2.73)	42	62	31
> 37 + 0	634 (96)	1.23 (0.49–2.54)	25	33	26
P-valuea		0.84	0.07	0.03*	0.67

^aP-value < 0.05 with Kruskal wallis test (BPA) or Chi² test (Autistic- or ADHD symptoms)

^b 4 observations missing

^c42 observations missing