Characteristics of the 507 262 women* who gave birth in Ontario from April 1, 2006, to March 31, 2011
| Characteristic | Primiparous women, % n = 320 094 | Multiparous women, % n = 187 168 |
|---|---|---|
| Age, yr | ||
| 18–25 | 22 | 9 |
| 25–29 | 31 | 24 |
| 30–34 | 30 | 37 |
| 35–39 | 14 | 24 |
| ≥ 40 | 3 | 5 |
| Socioeconomic status | ||
| Highest | 15 | 17 |
| Next to highest | 20 | 21 |
| Middle | 20 | 21 |
| Next to lowest | 21 | 20 |
| Lowest | 23 | 22 |
| Home location | ||
| Urban | 91 | 89 |
| Rural | 9 | 11 |
| Prenatal care | ||
| ≥ 13 clinic visits | 89 | 91 |
| ≥ 1 emergency department visits | 33 | 33 |
| ≥ 1 hospital admissions | 39 | 24 |
| Pregnancy duration | ||
| Preterm | 7 | 6 |
| At-term | 79 | 85 |
| Post-term | 14 | 9 |
| Delivery mode | ||
| Vaginal | 69 | 72 |
| Cesarean | 31 | 28 |
| Perinatal complications | ||
| Multiple gestations† | 2 | 1 |
| Fetal malposition‡ | 7 | 5 |
| Perinatal obstetrical§ | 56 | 39 |
| Miscellaneous amniotic¶ | 16 | 9 |
| Potential fetal abnormality** | 6 | 5 |
| Duration of hospital stay, d | ||
| ≤ 2 | 55 | 72 |
| ≥ 3 | 45 | 28 |
| Infant sex†† | ||
| Girl | 46 | 46 |
| Boy | 49 | 48 |
↵* Grouped by first presentation (no repeats in subsequent multipara group).
↵† Includes twins and higher multiples (codes Z372, Z375).
↵‡ Includes malpresentation (code O32).
↵§ Inadequate contractions, obstructed labour, umbilical cord complicated, major perineal trauma, intrapartum hemorrhage, postpartum hemorrhage (codes O62–O75, except O70).
↵¶ Polyhydramnios, oligohydramnios, premature rupture of membranes, amniotic cavity infection (codes O40–O42).
↵** Growth restriction, stillbirth, miscellaneous abnormality of fetus (codes O35–O37).
↵†† Unlisted for 5 infants in the primapara group and 6 in the multipara group.