Table 1.
Socio-demographic and lifestyle characteristics of participants in the PrOMIS cohort
| Variable | Mean ± SDa or n (%)b |
|---|---|
| Gestational age at recruitment | 10.9 ± 3.3 weeks |
| Maternal age | 28.0 ± 6.2 years |
| Age category | |
| 18–20 | 129 (5.0 %) |
| 20–29 | 1488 (57.1 %) |
| 30–34 | 544 (20.9 %) |
| ≥ 35 | 444 (17.0 %) |
| Ethnicity | |
| Mestizo (Mixed race ancestry) | 1980 (76.1 %) |
| Other | 621 (23.9 %) |
| Marital status | |
| Married or living with partner | 2095 (80.7 %) |
| Other | 500 (19.3 %) |
| Parity | |
| Nulliparous | 1316 (50.7 %) |
| Multiparous | 1282 (49.4 %) |
| Education level (years of education) | |
| ≤ 6 | 101 (3.9 %) |
| 7–12 | 1394 (53.7 %) |
| > 12 | 1103 (42.4 %) |
| Employment status | |
| Employed | 1200 (46.1 %) |
| Not employed | 1404 (53.9 %) |
| This pregnancy was planned | |
| Planned | 1097 (42.3 %) |
| Not planned | 1498 (57.7 %) |
| Smoked before this pregnancy | |
| Yes | 543 (20.9 %) |
| No | 2055 (79.0 %) |
| Currently smoking in this pregnancy | |
| Yes | 101 (3.9 %) |
| No | 2495 (96.1 %) |
a SD standard deviation
bDue to missing data, percentages may not add up to 100 %