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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)