Table 2. - Intra- and interrater reliability rates.
| GMFM-66 structure | N | Intrarater reliability ICC3,1 (95%CI) |
Interrater reliability ICC2,1 (95%CI) |
|---|---|---|---|
| GMFM-66 (GMAE) total score | 48 | 0.99 (0.98-0.99) | 0.97 (0.95-0.98) |
| Result per subscale | |||
| Dimension A | 48 | 0.98 (0.97-0.99) | 0.95 (0.93-0.97) |
| Dimension B | 48 | 0.99 (0.98-0.99) | 0.96 (0.94-0.98) |
| Dimension C | 48 | 0.99 (0.99-0.99) | 0.99 (0.98-0.99) |
| Dimension D | 48 | 0.99 (0.99-0.99) | 0.99 (0.99-0.99) |
| Dimension E | 48 | 0.99 (0.99-0.99) | 0.99 (0.99-0.99) |
| GMFM-66 total score (GMAE) per GMFCS |
|||
| GMFCS I | 12 | 0.98 (0.95-0.99) | 0.93 (0.84-0.98) |
| GMFCS II | 12 | 0.99 (0.97-0.99) | 0.98 (0.96-0.99) |
| GMFCS III | 12 | 0.99 (0.99-0.99) | 0.99 (0.99-0.99) |
| GMFCS IV | 12 | 0.92 (0.72-0.98) | 0.94 (0.84-0.98) |
N=number of subjects; GMFM=Gross Motor Function Measure; GMAE=Gross Motor Ability Estimator; GMFCS=Gross Motor Function Classification System; ICC=Intraclass Correlation Coefficients; CI=Confidence Interval.