Table 2.
Baseline and follow-up data on SF-36 of all subjects
| SF-36 | Baseline Mean (s.d.) (n = 99) | 1-year mean (s.d.) (n = 77) | 2-year mean (s.d.) (n = 36) | Effect sizea | Per cent achieving MCID | N (per cent) floor effect | N (per cent) ceiling effect |
|---|---|---|---|---|---|---|---|
| Physical function | 43.39 (11) | 48.44 (8.33)* | 48.73 (7.86) | 0.48 | 34 | 2 (2.1) | 9 (9.3) |
| Role physical | 43.68 (11.41) | 49.44 (10.41)* | 50.32 (9.33) | 0.50 | 36 | 3 (3.1) | 18 (18.4) |
| Bodily pain | 39.91 (11.23) | 52.12 (10.77)* | 52.26 (9.99) | 1.09 | 69 | 6 (6.1) | 6 (6.1) |
| General health | 43.04 (8.92) | 47.12 (9)* | 48.83 (7.86) | 0.49 | 38 | 0 (0) | 1 (1.0) |
| Vitality | 50.74 (12.24) | 54.97 (11.2)* | 56.37 (10.58) | 0.31 | 41 | 0 (0) | 7 (7.2) |
| Social functioning | 45.5 (11.89) | 51.18 (8.82)* | 52.15 (7.28) | 0.40 | 53 | 2 (2.0) | 32 (32.7) |
| Role emotional | 48.98 (11.04) | 51.69 (8.69) | 51.67 (7.4) | 0.20 | 22 | 1 (1.0) | 58 (58.6) |
| Mental health | 49.73 (11.92) | 52.91(10.51) | 54.43 (8.75) | 0.21 | 30 | 0 (0) | 11 (11.3) |
| SF-36 PCS | 40.37 (9.45) | 48.48 (8.89)* | 49.09 (9.15) | 0.91 | 70 | 0 (0) | 0 (0) |
| SF-36 MCS | 52.16 (10.8) | 54.15 (9.3) | 55.11 (8.64) | 0.08 | 38 | 0 (0) | 0 (0) |
aDifference from baseline to 1-year period. *P < 0.05; effect size = mean score1 year − mean scorebaseline.z/s.d.baseline.