Table 3.
Intraclass correlation coefficient (ICC), mean scores, and limits of agreement (LOA) between telephone and face-to-face administration of the Frenchay Activity Index (FAI) and EQ-5D
| Limits of agreement | |||||||
| Measure | ICC (95% CI) |
telephone mean (95% CI) |
face-to-face mean (95%CI) |
Lower LOA (95% CI) |
Mean difference (95% CI) |
Upper LOA (95% CI) |
p-value* |
| FAI – total | 0.94 (0.89, 1.00) |
18.7 (15.8, 21.6) |
19.6 (16.8, 22.4) |
-7.4 (-8.5, -6.4) |
-0.9 (-1.9, 0.2) |
5.7 (4.7, 6.7) |
0.100 |
| EQ-5D VAS | 0.58 (0.23, 0.93) |
67.6 (62.6, 72.7) |
68.3 (63.0, 73.7) |
-22.8 (-26.3, -19.3) |
0.7 (-2.8, 4.2) |
21.4 (17.9, 24.9) |
0.690 |
| EQ-5D utility | 0.82 (0.65,0.98) |
0.643 (0.559, 0.728) |
0.619 (0.528, 0.709) |
-0.268 (-0.314, -0.222) |
-0.025 (-0.071, 0.022) |
0.317 (0.271, 0.363) |
0.290 |
Note: *a p-value < 0.05 indicates that a systematic difference exists (i.e. telephone responses were either consistently higher or consistently lower than face-to-face responses)