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Table 2 Internal consistency of the HOOS subscales (n = 157)

From: Polish adaptation and validation of the hip disability and osteoarthritis outcome score (HOOS) in osteoarthritis patients undergoing total hip replacement

HOOS subscales (number of items)Cronbach’s alpha coefficients (95%CI) Pearson’s item to total correlation
At baselineAt follow-up At baselineAt follow-up
Pain (10)0.92 (0.89 to 0.94)0.95 (0.93 to 0.96) 0.59 to 0.810.71–0.85
Symptoms (5)0.78 (0.72 to 0.83)0.87 (0.83 to 0.91) 0.50 to 0.630.52–0.78
Function ADL (17)0.95 (0.94 to 0.96)0.97 (0.96 to 0.98) 0.55–0.800.64–0.87
Function sport/recreation (4)0.86 (0.82 to 0.89)0.89 (0.85 to 0.93) 0.69–0.740.58–0.85
QOL (4)0.76 (0.69 to 0.82)0.87 (0.83 to 0.91) 0.48–0.690.63–0.81
  1. internal consistency was assessed with use of Cronbach’s alpha coefficient and Pearson’s item to total (item-rest) correlations. Both assessments were made for all HOOS subscales prior to primary THR (at baseline, n = 157) and at one-year follow-up (n = 95)
  2. Abbreviations: CI confidence interval, THR total hip replacement, ADL activities of daily living, Sports/Rec sports and recreation function, QOL quality of life