Initial psychometric validation of the questionnaire on pain caused by spasticity (QPS)

Table 4 Cronbach’s α at baseline visit (V2) and test–retest reliability of QPS score V2–V3

QPS module	Mean (SD), V2	Internal consistency, V2 (Cronbach’s α)	Test–retest reliability, V2–V3 (ICC 2,1)
QPS module	QPS score	QPS score	QPS score	Single items^a
Child self LL (n = 68)	2.0 (1.3)	0.579	0.942	0.89–0.91
Child self UL (n = 30)	1.6 (1.2)	0.281	0.925	0.90–0.96
Child interviewer LL (n = 40)	3.7 (1.8)	0.780	0.940	0.82–0.93
Child interviewer UL (n = 14)	2.6 (1.9)	0.906	0.972	0.86–0.99
Parent LL (n = 122–125)	1.3 (0.7)	0.738	0.959	0.90–0.94
Parent UL (n = 51–52)	1.2 (0.7)	0.699	0.919	0.78–0.91

QPS modules: Self, self-administered; Interviewer, interviewer-administered
LL lower limb, UL upper limb
^aQPS items reported are items 5, 7, 9 and 12 for child modules and items 9b, 10b, 11b, and 13b for parent modules

ISSN: 1477-7525