Table 2.

Patient, pregnancy and delivery characteristics

	2000	2004	2008	OR (95% CI) 2000 - 2008
Patient and pregnancy characteristics	60993 women	61647 women	68199 women
Primiparae aged 35 or older	5.2%	6.6%	7.6%	1.50 (1.43 - 1.57)***
Multiparae aged 35 or older	15.9%	18.4%	20%	1.32 (1.28 - 1.36)***
Parity
First child	46.7%	47.8%	46.9%	1.01 (0.99 - 1.03)
Second child	34.2%	33.5%	34.9%	1.03 (1.01 - 1.06)**
Third child	12.7%	12.5%	12.2%	0.96 (0.92 - 0.99)**
Assisted Reproduction
Assisted induction of ovulation	1.7%	2.1%	2.1%	1.24 (1.14 - 1.35)***
Assisted Reproductive Technology (In vitro fertilisation and Intra Cytoplasmic Sperm Injection)	1.7%	2.3%	3.3%	1.97 (1.83 - 2.13)***
Twin pregnancies	1.80%	1.61%	1.83%	1.02 (0.94 - 1.10)
Hypertension during pregnancy	4.9% (2002)	4.8%	4.8%	0.98 (0.93 - 1.03)
Diabetes during pregnancy	1.2% (2002)	1.4%	1.8%	1.51 (1.38 - 1.66)***
Induction of labor	30.3%	27.6%	25.3%	0.78 (0.76 - 0.80)***
Preterm birth (GA < 37 weeks)	7.1%	7.5%	7.4%	1.05 (1.00 - 1.09)*
Delivery characteristics	62 128 births	62657 births	69470 births
Presentation
Vertex	95.0%	94.3%	94.1%	0.84 (0.80 - 0.88)***
Breech	4.6%	5.2%	5.4%	1.18 (1.13 - 1.25)***
Other	0.3%	0.5%	0.5%	1.67 (1.39 - 2.01)***
Low birth weight (< 2500 gr)	6.8%	6.9%	6.9%	1.02 (0.97 - 1.06)
Vaginal cephalic delivery	71.2%	69.8%	69.3%	0.91 (0.89 - 0.94)***
Vaginal breech delivery	0.5%	0.5%	0.3%	0.60 (0.50 - 0.72)***
Vacuum extraction	11.2%	9.7%	9.5%	0.83 (0.80 - 0.86)***
Forceps	1.3%	0.9%	0.8%	0.61 (0.55 - 0.68)***
Caesarean sections	16.4%	18.3%	19.5%	1.23 (1.20 - 1.27)***
Elective C - section	9.2%	10.8%	11.2%	1.24 (1.20 - 1.29)***
Unplanned C - section	6.6%	7.4%	8.2%	1.26 (1.21 - 1.32)***
Perinatal mortality	6.7‰	6.4%	6.2‰	0.92 (0.80 - 1.06)
Foetal death	4.4 ‰	4.3‰	4.3 ‰	0.98 (0.83 - 1.16)
Neonatal death	2.3 ‰	1.8‰	1.9 ‰	0.83 (0.65 - 1.06)

*P < 0.05, **P < 0.01, ***P < 0