I ncidence of oxygen desaturation below SpO2 94%: median (range): minutes per hour, for different analgesic groups:

Stage NA PE EB EBF
Last hour of first stage 0.2
(0-11.4)		 1.4
(0-16.4)*		 0
(0-0.2)*		 0
(0-12)
Second Stage 3.0
(0-10.8)**		 0.9
(0-7.7)		 0.1
(0.0-0.8)**		 0.9
(0-40.3)**

*In the last hour of the first stage the incidence of desaturation was significantly lower in the EB group when compared with the PE group (p < 0.001).
**In the second stage the incidence of SpO2 below 94% was significantly lower in the EB group compared with the EBF group (p < 0.05) and the NA group (p < 0.05).
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