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Participant characteristics
| Characteristic | Mamma Mia (n = 678) | Control (n = 664) |
|---|---|---|
| Age (years) mean (s.d.) | 31.0 (4.6) | 31.1 (4.5) |
| Education n (%) | ||
| ⩽ high school | 100 (14.7) | 107 (16.1) |
| 1–3 years college or university | 189 (27.9) | 183 (27.6) |
| ⩾4–5 years college or university | 389 (57.4) | 374 (56.3) |
| First language n (%) | ||
| Scandinavian | 630 (92.9) | 609 (91.7) |
| Non-Scandinavian | 48 (7.1) | 55 (8.3) |
| No. of previous children n (%) | ||
| No previous children | 393 (58.0) | 382 (57.5) |
| ⩾1 children | 285 (42.0) | 282 (42.5) |
