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| Belgium n = 819 | Iceland n = 585 | Denmark n = 1268 | Estonia n = 874 | Norway n = 2234 | Sweden n = 944 | Total N = 6724 | |
| Age mean (SD) | 28.4 (4.3) | 29.7 (5.0) | 31.9 (4.0) | 28.2 (5.1) | 30.5 (5.0) | 30.4 (4.6) | 30.1 (4.9 |
| Primiparous mean (SD) | 27.2 (4.0) | 26.8 (4.4) | 30.7 (4.0) | 25.5 (4.2) | 28.6 (4.9) | 29.1 (4.4) | 28.4 (4.7) |
| Multiparous mean (SD) | 29.8 (4.2) | 31.6 (4.5) | 33.4 (3.6) | 30.5 (4.7) | 32.0 (4.4) | 32.1 (4.4) | 31.7 (4.4) |
