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Table 5 Change in SF-36 subscales across study groups

From: Magnitude and meaningfulness of change in SF-36 scores in four types of orthopedic surgery

  Norm 95%CI Total hip replacement (controls) Total hip replacement (patients) Total knee replacement Arthroscopic partial meniscectomy Anterior cruciate ligament reconstruction
   SEM* MDC# ΔM (SD) SEM MDC ΔM (SD) SEM MDC ΔM (SD) SEM MDC ΔM (SD) SEM MDC ΔM (SD)
    Ind Grp    Ind Grp    Ind Grp    Ind Grp    Ind Grp  
PF 12 12 34 5 -2 (12) 18 49 4 27 (23) 15 41 6 29 (17) 16 45 6 15 (23) 14 40 6 34 (21)
RP 23 21 57 10 -2 (26) 33 91 8 33 (33) 30 84 12 35 (34) 32 88 11 27 (45) 29 81 12 50 (30)
BP 15 15 41 6 -3 (16) 20 54 5 37 (23) 19 51 7 36 (27) 17 46 6 20 (24) 17 48 7 31 (22)
GH 18 13 36 6 -4 (13) 14 39 4 0 (17) 13 35 5 3 (14) 10 27 3 -3 (14) 11 31 5 2 (12)
VT 16 12 34 6 -2 (14) 16 44 4 17 (20) 18 50 7 16 (22) 14 39 5 9 (20) 12 34 5 11 (14)
SF 26 17 48 7 -3 (21) 19 53 5 19 (24) 19 52 7 14 (25) 14 38 5 1 (19) 17 46 7 19 (26)
RE 28 28 79 14 3 (31) 35 97 9 25 (43) 34 94 14 24 (47) 27 74 9 9 (38) 28 78 11 30 (43)
MH 24 12 33 5 -3 (14) 15 40 4 12 (17) 14 39 6 8 (18) 12 33 4 5 (17) 12 34 5 12 (17)
  1. Note: 95%CI for population-based normative scores on SF-36 subscales [36].
  2. * SEM (Standard error of measurement) = √within subjects variance; Derived from ANOVA model with 'time of follow-up' as the within subjects factor.
  3. # MDCind (Minimal detectable change at individual level) = 1.96*√2*SEM; MDCgrp (Minimal detectable change at group level) = (1.96*√2*SEM)/√n.
  4. PF = Physical Functioning, RP = Role Physical, BP = Bodily Pain, GH = General Health, VT = Vitality, SF = Social Functioning, RE = Role Emotional, MH = Mental Health.