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Table 2 Change in Health-Related Quality of Life, health status and psychological distress

From: Decline in Health-Related Quality of Life reported by more than half of those waiting for joint replacement surgery: a prospective cohort study

   Baseline Preadmission Change Effect size p**
Construct n* Mean SD Mean SD Mean# 95% CI   
Health-Related Quality of Life (AQoL)          
   Overall sample 127 0.42 0.22 0.37 0.25 -0.04 -0.08 to -0.01 -0.19 0.02
Total hip replacement 63 0.42 0.23 0.36 0.24 -0.06 -0.11 to -0.02 -0.27 0.01
Total knee replacement 64 0.41 0.22 0.39 0.26 -0.02 -0.08 to 0.03 -0.10 0.39
Health status (WOMAC)          
   Overall sample 119 59.7 18.6 61.3 18.0 1.5 -1.1 to 4.2 -0.08 0.26
Total hip replacement 61 60.5 20.5 62.1 18.6 1.7 -1.9 to 5.2 -0.08 0.35
Total knee replacement 58 59.0 16.5 60.3 17.4 1.4 -2.7 to 5.4 -0.08 0.50
Psychological distress (K10)          
   Overall sample 132 20.2 7.7 20.7 8.0 0.5 -0.4 to 1.4 -0.07 0.25
Total hip replacement 65 19.7 7.9 20.2 8.0 0.5 -0.9 to 1.9 -0.06 0.50
Total knee replacement 67 20.7 7.6 21.3 8.0 0.5 -0.6 to 1.7 -0.07 0.33
  1. AQoL range: -0.04 (worst HRQoL) to 1.00 (full HRQoL); WOMAC range: 0 (best health state) to 100 (worst health state); K10 range: 10 (lowest psychological distress) to 50 (highest psychological distress)
  2. *Number of participants with complete baseline and preadmission data for each measure; does not total 134 due to missing data
  3. #Negative change score indicates deterioration for AQoL; positive change score indicates deterioration for WOMAC and K10
  4. Negative effect size indicates deterioration
  5. ** Paired t-test