. 2018 Mar 16;126(3):037005. doi: 10.1289/EHP1994

Table 1.

Characteristics of the population (40 pregnant women from SEPAGES feasibility study, out of which 8 participated in the current study).

Characteristic	Included ( $n = 8$ )	Excluded ( $n = 32$ )	p-Value^a
Characteristic	$N$ (%) or $mean \pm SD$	$N$ (%) or $mean \pm SD$	p-Value^a
Maternal age at enrollment (y)	$29.6 \pm 3.8$	$30.7 \pm 3.6$	0.34
Civil status			0.25
Married	5 (63)	12 (37)
Cohabitating	3 (37)	20 (63)
Maternal education			1.00
High school or less	0	2 (6)
$\leq 3 y$ of college	4 (50)	14 (44)
$> 3 y$ of college	4 (50)	16 (50)
Smoking history during pregnancy			1.00
Yes	1 (12)	6 (19)
No	7 (88)	21 (66)
Missing	0	5 (15)
Parity			1.00
Primiparous	5 (63)	19 (59)
Multiparous	3 (37)	13 (41)
Gestational age (wk)
Week 1 of urine collection	$15.0 \pm 1.9$	$12.9 \pm 1.5$	0.01
Week 2 of urine collection	$24.0 \pm 1.6$	$23.3 \pm 1.4$	0.21
Week 3 of urine collection	$32.3 \pm 0.7$	$31.8 \pm 0.9$	0.16
Time between two weeks of urine collection (wk)
Week 1–Week 2	$9.0 \pm 1.9$	$10.5 \pm 1.8$	0.06
Week 2–Week 3	$8.3 \pm 1.2$	$8.5 \pm 1.7$	0.88

Note: SD, standard deviation; SEPAGES, Suivi de l'Exposition à la Pollution Atmosphérique durant la Grossesse et Effets sur la Santé (Assessment of Air Pollution Exposure during Pregnancy and Effects on Health).

^{^a}

p-Values of chi-square or Mann-Whitney U-tests comparing the characteristics of included and non-included women.