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Table 6 QPS score correlation to GMFM-66, GMFCS, MACS, PedsQL™ (Pearson correlation coefficients at baseline visit [V2])

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

QPS module GMFM-66 GMFCS MACS PedsQL™ total scorea
Expected association Higher GMFM-66 score [0–100] relates to better motor function and lower QPS score Higher GMFCS/MACS levels [I–V] relate to higher disability and higher QPS score Higher PedsQL score [0–100] relates to better QoL and lower QPS score
Child self LL 0.258* (n = 68) −0.242*(n = 68) −0.067 (n = 68) −0.325 ** (n = 67)
Child self UL 0.185 (n = 30) −0.288 (n = 30) 0.299 (n = 30) −0.136 (n = 30)
Child interviewer LL −0.378* (n = 40) 0.503** (n = 40) 0.171 (n = 40) −0.685 ** (n = 21)
Child interviewer UL −0.485 (n = 14) 0.644*(n = 14) 0.150 (n = 14) −0.861 (n = 4)
Parent LL −0.052 (n = 125) 0.021 (n = 125) 0.017 (n = 125) −0.441 *** (n = 124)
Parent UL −0.145 (n = 52) 0.023 (n = 52) 0.029 (n = 52) −0.375 ** (n = 51)
  1. Significant associations are shown in bold, *p < 0.05; **p < 0.01; ***p < 0.001
  2. QPS modules: Self, self-administered; Interviewer, interviewer-administered
  3. GMFCS Gross Motor Function Classification System - Expanded and Revised, GMFM-66 Gross Motor Function Measure-66, LL lower limb, MACS Manual Ability Classification System, PedsQL™ Pediatric Quality of Life Inventory, SD standard deviation, UL upper limb
  4. aCorrelations of QPS child modules vs PedsQL™ child scores and QPS parent modules versus PedsQL™ parent score