58 Chapter 2 Additional file 2. Correlations within and between interventions and obstetric outcomes tested with Spearman’s rho (two-tailed significance level) All correlations are based on adjusted OR’s of the intervention rates of the region (adjusted for parity, maternal age, ethnic background, socioeconomic status and urbanisation). The correlations are therefore on region level and not on individual women level. A p-value of 0.05 corresponds with a correlation of ρ ≥ 0.57 or ≤ - 0.57 (95% confidence intervals 0.001-0.86). Since the sample size for all measured correlations is the same, namely 12 regions, the correlation is significant at the same value of ρ for all measured correlations. Correlations with ρ ≥ 0.60 or ≤ - 0.60 are indicated in bold type, since they are considered strong. Table 5. Correlations within interventions among women in midwife-led and interventions among women in obstetrician-led care at onset of labour Interventions among women in midwife-led care at onset of labour Augmentation after spontaneous onset of labour Epidural* Other pharmacological pain relief* Instrumental vaginal birth* Intrapartum CS* Involvement paediatrician <24 hours Interventions among women in obstetrician-led care at onset of labour Augmentation after spontaneous onset of labour ρ = 0.76 Epidural* ρ = 0.97 Other pharmacological pain relief* ρ = 0.97 Instrumental vaginal birth* ρ = 0.70 Intrapartum CS* ρ = 0.43 Involvement paediatrician <24 hours ρ = 0.67 *Measured in a group of women without prelabour CS.
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