| Group; weighted % of women* | |||
|---|---|---|---|
| Characteristic | Total cohort n = 175 174 | Non-users n = 161 766 | Users n = 13 408 |
| Pregnancy type | |||
| Live birth | 99.3 | 99.4 | 99.0 |
| Stillbirth or intrauterine death | 0.7 | 0.6 | 1.0 |
| Age at delivery, yr, median (IQR) | 28 (23-32) | 28 (23-32) | 27 (23-32) |
| Age at delivery, yr | |||
| ≤ 19 | 9.0 | 9.1 | 7.0 |
| 20-24 | 21.3 | 20.8 | 26.7 |
| 25-29 | 29.7 | 29.7 | 29.6 |
| 30-34 | 26.5 | 26.7 | 24.2 |
| ≥ 35 | 13.6 | 13.7 | 12.4 |
| No. of past pregnancies, including current pregnancy | |||
| 1 | 29.3 | 30.2 | 18.5 |
| 2 | 28.6 | 29.2 | 21.0 |
| 3 | 17.8 | 17.8 | 18.3 |
| ≥ 4 | 24.2 | 22.7 | 42.3 |
| No. of past deliveries† | |||
| 0 | 37.6 | 38.7 | 24.7 |
| 1 | 32.0 | 32.4 | 27.3 |
| 2 | 15.7 | 15.4 | 19.3 |
| ≥ 3 | 14.5 | 13.4 | 28.7 |
| Interval between conception date and first pregnancy-related visit, d, median (IQR) | 72 (52-93) | 72 (52-93) | 74 (52-101) |
| Income quintile‡ | |||
| 1 (lowest) | 26.3 | 25.2 | 40.0 |
| 2 | 20.5 | 20.6 | 19.2 |
| 3 | 18.5 | 18.8 | 15.7 |
| 4 | 18.4 | 18.8 | 14.0 |
| 5 (highest) | 15.9 | 16.4 | 10.7 |
Note: IQR = interquartile range.
*Except where indicated otherwise.
†Data on number of past deliveries were not available for 0.1% of the total cohort, 0.1% of non-users and 0.1% of users.
‡Data on income were not available for 0.4% of the total cohort, 0.4% of non-users and 0.3% of users.