Table 2.

Comparison of failure rates with failure characteristics between different levels of anesthesiologistsa

Level of anesthesiologists	n	Pain Score >4 at 45 min	Need to Re-site	Abandoned	ADP	Dissatisfied at follow-up	Overall failure*	Odds Ratio [95%CI]
2nd or 3rd Years	190	21	4	3	2	29	37 (19.5%)†	2.08 [1.17-3.67]
4th Years	99	8	2	0	2	11	17 (17.2%)‡	1.78 [0.89-3.53]
5th years and above	211	10	5	0	4	15	22 (10.4%)	Ref
Total	500	39 (8%)	11 (2.2%)	3 (0.6%)	8 (1.6%)	55 (11%)	76 (15.2%)

^aData are number (%). ADP: accidental dural puncture; Logistic regression was used to observe ^†P=0.012 and ^‡P=0.098 vs. 5^th years and above. *Some women had more than one reason for failure. Ref=References group