Table 2.
Delivery characteristics among women with singleton births with and without placenta previa during 2000–2010 in Finland
| Characteristics | NULLIPAROUS WOMEN, n=249,476 | MULTIPAROUS WOMEN, n=347,086 | ||||
|---|---|---|---|---|---|---|
| PP, n=625 (0.3%) |
No PP, n=248,851 (99.7%) |
p value* | PP, n=915 (0.3%) |
No PP n=346,171 (99.7%) |
p value* | |
| Mean maternal age years (SD) | 30.6 (5.4) | 27.3 (5.3) | ≤0.001 | 32.6 (5.1) | 31.0 (5.1) | ≤0.001 |
| Maternal age years % | ≤0.001 | ≤0.001 | ||||
| Less than 20 | 1.9 | 6.0 | 0.1 | 0.4 | ||
| 20–29 | 38.6 | 61.2 | 27.8 | 39.1 | ||
| 30–39 | 54.4 | 31.1 | 63.2 | 55.6 | ||
| 40 or more | 5.1 | 1.6 | 9.0 | 4.9 | ||
| Mean gestational age weeks (SD) | 37.7 (2.9) | 39.8 (1.9) | ≤0.001 | 37.1 (3.0) | 39.8 (1.7) | ≤0.001 |
| Smoking status % | 0.002 | 0.22 | ||||
| Non-smoking | 85.8 | 80.5 | 83.6 | 84.1 | ||
| Smoking | 12.0 | 17.5 | 14.2 | 13.0 | ||
| Missing information | 2.2 | 2.1 | 2.2 | 3.0 | ||
| Married or in relationship % | 94.2 | 90.7 | 0.003 | 95.4 | 95.1 | 0.72 |
| Socioeconomic status % | ≤0.001 | 0.08 | ||||
| Upper white-collar worker | 8.0 | 8.0 | 8.5 | 8.6 | ||
| Lower white-collar worker | 39.0 | 31.8 | 34.4 | 36.6 | ||
| Blue-collar worker | 11.4 | 13.7 | 15.4 | 15.0 | ||
| Others b | 20.8 | 27.1 | 23.3 | 24.5 | ||
| Missing | 20.8 | 19.3 | 18.5 | 15.2 | ||
| Number of prior deliveries % | NA | NA | 0.007 | |||
| 1 | 56.4 | 57.3 | ||||
| 2–4 | 36.9 | 38.2 | ||||
| 5 or more | 6.7 | 4.5 | ||||
| Prior caesarean section % | NA | NA | 28.9 | 17.9 | ≤0.001 | |
| Prior preterm birth % | NA | NA | 13.1 | 7.3 | ≤0.001 | |
| Prior SGA infant % | NA | NA | 7.8 | 5.1 | ≤0.001 | |
| Prior preeclampsia % | NA | NA | 0.5 | 0.4 | 0.43 | |
| In vitro fertilisation (IVF) % | 12.8 | 2.2 | ≤0.001 | 4.3 | 0.8 | ≤0.001 |
| Preeclampsia | 0.8 | 0.9 | 0.83 | 2.7 | 1.5 | 0.001 |
| Gestational diabetes % | 9.9 | 7.6 | 0.03 | 14.3 | 13.0 | 0.24 |
| Pre-existing diabetes mellitus % | 7.2 | 5.5 | 0.07 | 11.7 | 9.7 | 0.04 |
| Male sex % | 54.1 | 51.1 | 0.14 | 53.6 | 51.1 | 0.14 |
| Mean birth weight grams (SD) | 3063.4 (661) | 3438.2 (539) | ≤0.001 | 3038.8 (759) | 3615.5 (532) | ≤0.001 |
| Mode of delivery % | ≤0.001 | ≤0.001 | ||||
| Vaginal spontaneous | 16.0 | 66.2 | 20.4 | 84.0 | ||
| Breech | 0.2 | 0.7 | 0.3 | 0.5 | ||
| Vacuum assistance | 3.2 | 13.7 | 1.0 | 2.9 | ||
| Forceps | 2.7 | 0.1 | 0.7 | 0.0 | ||
| Caesarean section | 77.9 | 19.4 | 77.6 | 12.7 | ||
b
Others comprise entrepreneurs, students, retired women, unemployed women, housewives and all unclassifiable cases
*
Chi square or Mann Whitney U –test, p value significant at <0.05
NA=not applicable; PP=Placenta Previa; SD=Standard Deviation