Table 5.
Change in SF-36 subscales across study groups
| 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) |
Note: ¶ 95%CI for population-based normative scores on SF-36 subscales [36].
* SEM (Standard error of measurement) = √within subjects variance; Derived from ANOVA model with 'time of follow-up' as the within subjects factor.
# MDCind (Minimal detectable change at individual level) = 1.96*√2*SEM; MDCgrp (Minimal detectable change at group level) = (1.96*√2*SEM)/√n.
PF = Physical Functioning, RP = Role Physical, BP = Bodily Pain, GH = General Health, VT = Vitality, SF = Social Functioning, RE = Role Emotional, MH = Mental Health.