Table 1.

Characteristics of the study population ($n=381$).

Continuous variables	$\text{M}\text{e}\text{a}\text{n}\pm \text{S}\text{D}$	Min	Percentiles			Max	Association with log(SpG-adj BPA) (r)c
			25th	50th	75th
Maternal age (years)	$31.1\pm 5.6$	18.3	27.4	31.8	35.3	45.2	$-0.16$
Gestational age at birth (weeks)	$39.4\pm 1.6$	32.9	38.9	39.6	40.6	42.3	0.03
Age at exam (days)	$4.4\pm 10.4$	0	1.0	1.0	2.0	65.0	0.11
z-score weight for age	$-0.4\pm 1.3$	$-5.3$	$-1.0$	$-0.3$	0.4	8.6	0.06
Postconception age at exam (weeks)	$40.1\pm 2.0$	35.0	39.1	40.0	41.0	49.0	0.11
AGD-AC (mm)a	$36.6\pm 3.8$	16.5	34.1	36.8	39.1	53.3	$-0.10$
AGD-AF (mm)	$16.0\pm 3.2$	8.0	13.9	15.7	18.2	28.5	0.03
Time of urine collection (hours since midnight)	$12.6\pm 2.5$	7.5	10.5	12.5	14.8	19.8	0.16
Gestational age at urine collection (weeks)	$10.8\pm 2.0$	5.1	9.4	11.0	12.3	15.7	0.01
SpG-adj $\mathrm{B}\mathrm{P}\mathrm{A}(\mathrm{\mu }g/\mathrm{L})$	$1.8\pm 2.5$	0.04	0.6	1.0	1.9	27.1	—
Categorical variables	$n$ (%)b
Center
UCSF	98 (25.7)
UMN	94 (24.7)
URMC	109 (28.6)
UW	80 (21.0)
Race/ethnicity
White/non-Hispanic	225 (60.5)
Other	147 (39.5)
Education
High school or less	55 (14.7)
Some college or more	320 (85.3)

Note: AGD-AC, anogenital distance from the anus to the clitoris; AGD-AF, anogenital distance from the anus to the fourchette; BPA, Bisphenol A; Max, maximum; Min, minimum; SD, standard deviation; SpG-adj, specific gravity–adjusted; UCSF, University of California, San Francisco; UMN, University of Minnesota; URMC, University of Rochester Medical Center; UW, University of Washington.

^aOne infant did not have an AGD-AC measurement, so $n=380$.

^bPercentages may not total exactly 100% due to rounding.

^cLog-transformed specific gravity–adjusted concentrations. Pearson’s correlation was used to examine associations with continuous variables.