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

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

QPS module Mean (SD), V2 Internal consistency, V2 (Cronbach’s α) Test–retest reliability, V2–V3 (ICC 2,1)
QPS score QPS score QPS score Single itemsa
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
  1. QPS modules: Self, self-administered; Interviewer, interviewer-administered
  2. LL lower limb, UL upper limb
  3. aQPS items reported are items 5, 7, 9 and 12 for child modules and items 9b, 10b, 11b, and 13b for parent modules