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Table 3 QPS item-to-item and item-to-total correlations (Pearson correlations)

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

QPS module Item-to-item correlation range Item-to-total correlations
General pain item Other four activity items
Child self LL (n = 68) −0.037 to 0.611 0.099 to 0.705 0.322 to 0.788
Child self UL (n = 30) 0.003 to 0.698 −0.022 to 0.702 0.392 to 0.745
Child interviewer LL (n = 40) 0.178 to 0.490 0.316 to 0.549 0.734 to 0.817
Child interviewer UL (n = 14) 0.387 to 0.754 0.676 to 0.859 0.867 to 0.913
Parent LL (n = 125) 0.263 to 0.464 0.359 to 0.554 0.679 to 0.801
Parent UL (n = 52) 0.304 to 0.526 0.179 to 0.640 0.531 to 0.842
  1. QPS items reported are items 3, 5, 7, 9 and 12 for child modules and items 8, 9b, 10b, 11b, and 13b for parent modules
  2. QPS modules: Self, self-administered; Interviewer, interviewer-administered
  3. LL lower limb, UL upper limb