Preprocedure ultrasound imaging combined with palpation technique in epidural labor analgesia

Table 2 Duration of the procedure

All parturients	Combined group (n = 36)	Palpation group (n = 36)	P value
Total duration of the epidural procedure(s)	406.5 ± 92.15	380.0 ± 128.2	0.318
Time to perform epidural puncture and catheterization procedure (s)	320.62 ± 87.33	380.0 ± 128.2	0.0011
Time to perform ultrasound procedure (s)	85.83 ± 3.92	NA	NA

¹Significant statistical analyses. All values expressed as the mean ± SD. There was no significant difference in duration of the total epidural procedure between the two groups.