Table 5.

Relationship between changes for breakthrough pain in PD, VAS, SF-Mcgill, and NRSSIS at postoperative 48 hours.

	PD vs. VAS-BTP	SF-Mcgill					PD vs. NRSSIS
		PD vs. sensory score	PD vs. effective score	PD vs. total score	PD vs. VAS	PD vs. PPI
γ	0.64	0.548	0.323	0.526	0.522	0.0743	0.31
ρ	0.001	0.001	0.067	0.002	0.002	0.001	0.079
n	33	33	33	33	33	33	33

PD: pain degree, VAS: visual analog scale, SF-Mcgill: short form Mcgill pain questionnaire, NRSSIS: numeric rate scale sleep interference score, PPI: present pain intensity, vs.: versus, and VAS-EP: visual analog scale for breakthrough pain.