Table 1.
Clinical characteristics and obstetric interventions for the whole study population. Data are presented in frequencies (and numbers). p Values from χ2 test
| Primiparous women |
Multiparous women |
|||
|---|---|---|---|---|
| Time period | 2003–2005 | 2008–2010 | 2003–2005 | 2008–2010 |
| n vaginal deliveries | n=8051 | n=8837 | n=6736 | n=8085 |
| Risk factors | ||||
| Age (years) | p<0.001 | p<0.001 | ||
| 15–29 | 48.3 (n=3885) | 43.8 (n=3872) | 27.4 (n=1849) | 21.4 (n=1730) |
| 30–34 | 39.3 (n=3164) | 40.8 (n=3604) | 42 (n=2823) | 40.7 (n=3287) |
| 35–51 | 12.4 (n=1002) | 15.4 (n=1361) | 30.6 (n=2064) | 37.9 (n=3068) |
| Birthweight (g) | p=0.003 | p=0.60 | ||
| 720–2999 | 16.4 (n=1321) | 16.4 (n=1446) | 11.8 (n=794) | 11.6 (n=938) |
| 3000–3499 | 37.9 (n=3050) | 39.2 (n=3470) | 32.5 (n=2191) | 32 (n=2591) |
| 3500–3999 | 33.2 (n=2670) | 33.8 (n=2983) | 36.3 (n=2447) | 37.5 (n=3029) |
| 4000–4499 | 11 (n=885) | 9.3 (n=821) | 15.6 (n=1049) | 15.4 (n=1247) |
| 4500–5850 | 1.5 (n=125) | 1.3 (n=117) | 3.8 (n=255) | 3.5 (n=280) |
| Delivery method | p<0.001 | p=0.45 | ||
| Spontaneous | 81.5 (n=6558) | 78.3 (n=6918) | 96.2 (n=6479) | 96.4 (n=7793) |
| Ventouse | 16.5 (n=1331) | 20.4 (n=1802) | 3.5 (n=234) | 3.4 (n=273) |
| Forceps | 2 (n=162) | 1.3 (n=117) | 0.3 (n=23) | 0.2 (n=19) |
| Episiotomy, all vaginal deliveries | p<0.001 | p=0.066 | ||
| 31.4 (n=2528) | 36.2 (n=3203) | 7.3 (n=492) | 8.1 (n=656) | |
| Episiotomy, spontaneous deliveries | p=0.006 | p=0.98 | ||
| 24.7 (n=1620) | 22.7 (n=1569) | 6.1 (n=396) | 6.1 (n=477) | |
| Episiotomy, instrumental deliveries | p<0.001 | p<0.001 | ||
| 60.8 (n=908) | 85.1 (n=1634) | 37.4 (n=96) | 61.3 (n=179) | |
| Duration second stage (min) | p=0.057 | p=0.45 | ||
| 0–29 | 34.1 (n=2736) | 32.5 (n=2864) | 84.9 (n=5696) | 85.4 (n=6895) |
| 30–59 | 41 (n=3290) | 41.6 (n=3673) | 12.5 (n=839) | 11.9 (n=957) |
| 60–205 | 24.9 (n=1994) | 25.9 (n=2288) | 2.6 (n=174) | 2.7 (n=219) |