Table 1. Background characteristics of Finnish first-time mothers in 1996–2013 by previous TOPs and methods.
| Characteristics | No prior TOP (n = 365356) |
Medical TOP (n = 13450) |
Surgical TOP (n = 38659) |
Both (n = 2414) |
Total (n = 419879) |
P-value* |
|---|---|---|---|---|---|---|
| % | % | % | % | % | ||
| Maternal age | ||||||
| Mean (SD) | 27.4 (5.2) | 26.1 (5.3) | 28.2 (5.5) | 27.4 (5.5) | 27.4 (5.2) | <0.0001 |
| ≤19 | 5.8 | 8.3 | 4.6 | 3.6 | 5.8 | |
| 20–24 | 24.5 | 35.7 | 22.6 | 28.1 | 24.7 | |
| 25–29 | 36.9 | 31.4 | 32.7 | 32.6 | 36.3 | |
| 30–34 | 23.6 | 17.2 | 26.3 | 23.2 | 23.7 | |
| 35–39 | 7.7 | 5.9 | 11.2 | 9.6 | 7.9 | |
| ≥40 | 1.5 | 1.4 | 2.6 | 2.9 | 1.6 | |
| Marital status | ||||||
| Married/cohabiting | 86.0 | 78.6 | 77.5 | 74.4 | 84.9 | <0.0001 |
| Unmarried/Single | 12.6 | 20.8 | 20.3 | 25.1 | 13.7 | |
| Unknown | 1.4 | 0.6 | 2.2 | 0.6 | 1.4 | |
| Type of residence | ||||||
| Urban | 71.1 | 73.3 | 73.3 | 76.0 | 71.4 | <0.0001 |
| Semi-urban | 14.2 | 14.1 | 14.1 | 12.2 | 14.1 | |
| Rural | 14.1 | 11.9 | 13.1 | 11.2 | 13.9 | |
| Abroad | 0.6 | 0.7 | 0.4 | 0.5 | 0.6 | |
| Smoking status | ||||||
| No smoking | 82.7 | 63.5 | 67.6 | 54.8 | 80.5 | <0.0001 |
| Stopped smoking in third trimester | 4.8 | 11.9 | 6.3 | 11.6 | 5.2 | |
| Smoked after first trimester | 10.5 | 22.6 | 23.8 | 31.5 | 12.3 | |
| Birth year of child | ||||||
| 1996–2000 | 26.7 | 3.9 | 36.1 | 7.9 | 26.7 | <0.0001 |
| 2001–2005 | 27.2 | 12.4 | 33.2 | 18.5 | 27.2 | |
| 2006–2010 | 29.1 | 43.9 | 22.9 | 45.3 | 29.1 | |
| 2011–2013 | 17.0 | 39.8 | 7.9 | 28.3 | 16.9 | |
*P-value from chi square test and statistical significance at the level of 0.05