Table 3.

BMI and characteristics of epidural placements by difficulty and failure

	All patients	No difficulty	Difficulty	p value
BMI	31.9±0.1	31.8±0.1	36.5±0.9	< 0.001
Placement time (min)	29.3±0.2	28.7±0.2	48.7±2.3	< 0.001
Training (months)	22.8±0.2	22.9±0.2	20.8±1.1	0.081
Failure (%)	4.3	4.0	13.3	< 0.001
	All patients	No failure	Failure	p value
BMI	31.9±0.1	31.8±0.1	34.1±0.7	0.002
Placement time (min)	29.3±0.2	28.9±0.2	36.9±1.8	< 0.001
Training (months)	22.8±0.2	22.9±0.3	19.9±0.9	0.002
Difficulty (%)	3.0	2.7	9.4	< 0.001

Data are mean ± standard error or percentage. * P<0.05. Abbreviation: BMI = body mass index