Table 6 Reliability and internal consistency of the Spine Functional Index (SFI) with 10 items
Variable | Value |
|---|---|
Mean (standard deviation) | |
Test | 75.54 (17.03) |
Retest | 78.83 (15.99) |
Intraclass correlation coefficient | 0.826 |
Confidence interval at 95% | 0.701, 0.902 |
Standard error of measurement | |
Score | 7.00 |
% | 9.08 |
Minimum detectable change | |
Score | 19.42 |
% | 25.15 |
Cronbach’s alpha | 0.864 |