VALIDATION DATA

For FI-3, the ICC was 0.96 (95% confidence interval [CI]: 0.92, 0.98) for the right shoulder flexion task and 0.92 (95% CI: 0.83, 0.97) for the left shoulder flexion task. The ICC was 0.94 (95% CI: 0.87, 0.97) for the neck flexion task. The ICC was 0.88 (95% CI: 0.74, 0.94) for the right hip flexion task and 0.93 (95% CI: 0.86, 0.97) for the left hip flexion task. The measurement of error for each FI-3 task was calculated: right shoulder flexion (6.8); left shoulder flexion (9.3); neck flexion (9.0); right hip flexion (13.2); left hip flexion (10.0). The ICC for the total score was 0.95 (0.89-0.98)

The measurement of error for each FI-3 task was calculated: right shoulder flexion (15.5); left shoulder flexion (13.9); neck flexion (14.1); right hip flexion (8.4); left hip flexion (7.4). The ICC for the total score was 0.93 (0.83, 0.98).

The FI-2 tasks were scrutinized and the range of FI-2 mean scores was 8.2 ± 10.8 to 40.2 ± 29.5. No ceiling effects (defined as median values of 20-50 percentile of total variation of values) were observed in any tasks. Correlation coefficients for analysis of internal redundancy for FI-2 tasks in the upper extremities varied between rs 0.89-0.94, with the highest correlations between shoulder flexion and shoulder abduction. The shoulder flexion task ranged between 0- 60 with no tendency towards ceiling effect while the median shoulder abduction equaled the maximal number of repetitions 60; therefore, the shoulder abduction latter task was removed due to internal redundancy. Coefficients for analysis of tasks in the lower extremities varied between rs 0.63-0.84. The cut-off for exclusion due to poor internal redundancy was rs <0.60