Table 1 Socio-demographic characteristics of the 1,931 participants

From: The impacts of air pollution on maternal stress during pregnancy

Variable names

No (%), mean ± SD, or Medium (P25, P75)

Age (years); missing n = 9

28.0 (4.0)

Maternal education; missing n = 8

Junior high school or lower

442 (23.0%)

Senior high school

353 (18.4%)

College or University level

985 (51.2%)

Postgraduate level

143 (7.4%)

Family monthly income (RMB/month); missing n = 37

<2,000

311 (16.4%)

2,000–5,000

699 (36.9%)

5,000–10,000

565 (29.8%)

>10,000

319 (16.8%)

Type of family structure; missing n = 17

Living with husband

997 (52.2%)

Living with husband and parents-in-law

605 (31.7%)

Living with parents

222 (11.6%)

Living alone

87 (4.6%)

Complications of pregnancy; missing n = 3

No

1653 (85.7%)

Yes

275 (14.3%)

Abortion history; missing n = 15

Never

1199 (62.6%)

1–2 times

654 (34.1%)

3 or more times

63 (3.3%)

Maternal GSI score

1.2 (1.1, 1.3)

Total score of LESPW; missing n = 3

230.7 (84.0, 332.0)