40 Chapter 2 Figure 4. Significant differences in adjusted* OR between regions in incidences of: a. spontaneous births b. caesarean sections c. intrapartum oxytocin use *Adjusted for parity, maternal age, ethnic background, socioeconomic status and urbanisation GR = Groningen; FR = Friesland; DR = Drenthe; OV = Overijssel FL = Flevoland; GD = Gelderland; UT = Utrecht; NH = Noord-Holland; ZH = Zuid-Holland; ZL = Zeeland; NB = Noord-Brabant; LB = Limburg.
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