Table 3.
Mean change and responsiveness in Activity Assessment Scale score from 2-weeks to 6-months postoperatively by change in SF-36 Physical Function
SF-36 Physical Functioning | N Total = 148 | mean (SD) at 2-weeks | mean (SD) at 6 month follow-up | Mean AAS Change (SD) | Effect size | P- value* |
---|---|---|---|---|---|---|
Improved | 123 | 76.77 (20.24) | 94.19 (12.08) | 17.42 (19) | 0.86 | 0.020 |
No Change | 11 | 85.57 (13.78) | 93.15 (9.34) | 7.57 (12.4) | 0.55 | |
Worse | 14 | 81.4 (19.66) | 85.55 (17.82) | 4.15 (24.5) | 0.21 |
F-statistics testing whether AAS change differs among the three categories according to SF-36 physical functioning subscale.
For 2-week < 40: +/− 2 points for “no change” category, > 2 for “improving”, < −2 for “worsening”;
For 2-week ≥ 40: +/− 3 points for “no change” category, > 3 for “improving”, < −3 for “worsening”