Different Learning Curves for Axillary Brachial Plexus Block: Ultrasound Guidance versus Nerve Stimulation

Table 1

Preoperative patient characteristics. Data are numbers or mean (±SD).

	Ultrasound	Nerve stimulator	𝑃-values
Number of records	259	343	—
Age mean(SD)	47 (±19.65)	46 (±18.16)	.866
Gender (f : m)	99 : 163	127 : 201	.816
Missing Data or not defined	—	15
BMI	26 (±5.34)	25 (±4.68)	.631
Surgical characteristics
Bones hand	66 (25.5)	74 (22.2)
Hand soft tissues	155 (61.0)	187 (56.2)
Bones forearm	26 (10.0)	37 (16.9)	.058
Forearm soft tissues	12 (4.6)	35 (5.1)
Missing data or not defined	—	10
ASA physical status
I	94 (36.3)	139 (41.9)
II	122 (47.0)	147 (44.3)	.344
III	43 (16.6)	46 (13.3)
Missing Data or unclear	—	11