41 Regional variations in childbirth interventions in the Netherlands Figure 5. Regional variation of augmentation of labour after spontaneous onset for women in midwife-led care and obstetrician-led care The reference category (OR of 1.0) is the weighted overall rate of the country. ρ (rho) is the coefficient between the two point markers in the figure (augmentation of labour for women in midwife-led care versus obstetrician-led care), which corresponds with the correlation described in table 5. Figure 6. Regional variation of prelabour CS and induction of labour for all women The reference category (OR of 1.0) is the weighted overall rate of the country. ρ (rho) is the coefficient between the two point markers in the figure (prelabour CS and induction of labour), which corresponds with the correlation described in table 7. 2
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