Skip to main content

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

From: Telephone reliability of the Frenchay Activity Index and EQ-5D amongst older adults

     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
  1. 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)