Retrospective Observational Study on the Characteristics of Pain and Associated Factors of Breakthrough Pain in Advanced Cancer Patients

Table 2

Comparison and correlation analysis in patients with different background pain level.

	Background pain level	Median (IQR)	Coefficient
BTP intensity	Mild	6 (6, 7)	5.954	0.051
	Moderate	6 (6, 7)
	Severe	7 (6, 7)
			0.086^a	0.074
BTP episodes	Mild	3 (2, 6)	3.633	0.163
	Moderate	4 (2, 7)
	Severe	5 (2, 7)
			0.107^a	0.027
Length of stay	Mild	9 (6, 15)	3.287	0.038
	Moderate	10 (7, 15.5)
	Severe	11 (8.25, 18.75)
			0.05^a	0.154
PS	Mild	2 (1, 3)	1.689	0.430
	Moderate	2 (1, 3)
	Severe	2 (1, 2.75)
			0.116^a	0.001
Distress score	Mild	2 (2, 2)	2.631	0.268
	Moderate	2 (2, 2.5)
	Severe	2 (1, 2)
			0.039^a	0.272
Barthel index	Mild	65 (50, 80)	6.061	0.048
	Moderate	60 (50, 75)
	Severe	70 (55, 80)
			−0.008^a	0.822
Symptom numbers	Mild	4 (2, 6)	11.347	0.003
	Moderate	4 (2.5, 6)
	Severe	4 (2, 6.75)
			0.135^a	<0.001

Kruskal–Wallis test; IQR, interquartile range; ^aSpearman correlation.