Effect of different types of laryngeal mask airway placement on the right internal jugular vein: A prospective randomized controlled trial

Table 2 Overlap index

	Group 1, n = 32	Group 2, n = 39	Group 3, n = 29	P value
High point
Before LMA	21.7 (6.5, 61.5)	23.4 (0, 51.6)	25.7 (12.2, 60.2)	0.712
After LMA	100 (100, 100)d	72.1 (40.0, 100)ad	100 (69.0, 100)ad	0.000
Middle point
Before LMA	52.8 (29.1, 82.7)	44.8 (18.5, 65.9)	40.3 (19.6, 100)	0.624
After LMA	100 (100, 100)d	100 (100, 100)d	100 (100, 100)d	0.318
Low point
Before LMA	26.2 (0.0, 97.8)	41.0 (11.5, 94.5)	30.3 (0, 100)	0.465
After LMA	67.8 (18.5, 100)d	56.3 (12.1, 100)	54.7 (22.5, 100)d	0.993

^aP < 0.05 vs group 1;

^dP < 0.01 vs before laryngeal mask airway within group. Results are presented as median (interquartile range). LMA: Laryngeal mask airway.