ICCs of the seat pressure measurements.
| Measurement | 0/30/90 min | 0/30 min | 30/90 min | Every 5 min Over 90 min |
| ICC of the pressure mean values | ||||
| All participants | 0.53 | 0.43 | 0.85 | NA |
| Active participants | 0.61 | 0.38 | 0.87 | NA |
| Inactive participants | 0.78 | 0.69 | 0.85 | NA |
| Weight measurements (all cushions) | 0.92 | 0.90 | 0.96 | 0.99 |
| ICC of the pressure-loaded measuring surface | ||||
| All participants | 0.97 | 0.95 | 0.98 | NA |
| Active participants | 0.98 | 0.95 | 0.99 | NA |
| Inactive participants | 0.52 | 0.65 | 0.92 | NA |
| Weight measurements (all cushions) | 0.75 | 0.57 | 0.97 | 0.99 |
| ICC of the vertical center of pressure position | ||||
| All participants | 0.97 | 0.96 | 0.96 | NA |
| Active participants | 0.97 | 0.96 | 0.97 | NA |
| Inactive participants | 0.99 | 0.98 | 0.99 | NA |
| Weight measurements (all cushions) | 0.98 | 0.97 | 0.99 | 0.99 |
| ICC of the horizontal center of pressure position | ||||
| All participants | 0.99 | 0.98 | 0.91 | NA |
| Active participants | 0.99 | 0.99 | 0.91 | NA |
| Inactive participants | 0.86 | 0.74 | 0.98 | NA |
| Weight measurements (all cushions) | 0.96 | 0.94 | 0.98 | 0.99 |
Abbreviations: ICC, intraclass correlation coefficient; NA, not applicable.
Note: In general, an ICC above 0.75 is an indicator of excellent reliability, while an ICC below 0.75 indicates good to poor reliability.19 ICCs of maximum pressure cannot be calculated due to missing variance after 90 minutes (Table 3).