38 Chapter 2 Figure 2a. Regional variation of epidural analgesia and other pharmacological pain relief for women in midwife-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 (epidural analgesia and other pharmacological pain relief), which corresponds with the correlation coefficient described in table 6. Figure 2b. Regional variation of epidural analgesia and other pharmacological pain relief for women in 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 (epidural analgesia and other pharmacological pain relief), which corresponds with the correlation coefficient described in table 6.
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