Table 2.
Comparison between the paper and app versions of the American Orthopaedic Foot and Ankle Society (AOFAS) questionnaire.
| Reliability | Paper (%), mean (SD) | App (%), mean (SD) | Mean difference (%) | P | ICC (95% CI) | |
| Total | 93.96 (8.47) | 93.94 (8.48) | 0.02 | >.99 | 0.99 (0.98-0.99) | |
| Questions | ||||||
| Q1 | 37.60 (4.76) | 37.60 (4.76) | 0.00 | >.99 | 1.00 (1.00-1.00) | |
| Q2 | 9.82 (0.59) | 9.98 (0.59) | 0.06 | >.99 | 0.88 (0.79-0.93) | |
| Q3 | 4.88 (0.32) | 4.84 (0.50) | 0.04 | >.99 | 0.87 (0.78-0.93) | |
| Q4 | 4.44 (0.90) | 4.44 (0.90) | 0.00 | >.99 | 1.00 (1.00-1.00) | |
| Q5 | 7.78 (0.88) | 7.78 (0.88) | 0.00 | >.99 | 1.00 (1.00-1.00) | |
| Q6 | 8.00 (0.00) | 8.00 (0.00) | 0.00 | >.99 | —a | |
| Q7 | 5.94 (0.42) | 5.94 (0.42) | 0.00 | >.99 | 1.00 (1.00-1.00) | |
| Q8 | 7.20 (2.42) | 7.20 (2.42) | 0.00 | >.99 | 1.00 (1.00-1.00) | |
| Q9 | 8.36 (2.51) | 8.46 (2.55) | 0.10 | >.99 | 0.98 (0.96-0.98) | |
aThe variables have zero variance.