Table 4.
Agreement between observed and predicted scores on the HAQ-DI and PF-10 in the cross-validation sample (n = 532)
| ICC (95% CI) |
Mean (SD) |
Mean (SD) |
Mean (SD) |
LOA | |
|---|---|---|---|---|---|
| observed scores | predicted scores | difference | |||
| HAQ-SDI |
0.78 (0.74 to 0.81) |
0.65 (0.64) |
0.72 (0.71) |
−0.07 (0.44) |
−0.93 to 0.80 |
| HAQ-ADI |
0.77 (0.72 to 0.80) |
0.53 (0.57) |
0.63 (0.65) |
−0.10 (0.40) |
−0.88 to 0.68 |
| PF-10 (predicted from HAQ-SDI) |
0.79 (0.75 to 0.82) |
67.39 (25.71) |
69.60 (23.26) |
−2.21 (15.80) |
−33.18 to 28.76 |
| PF-10 (predicted from HAQ-ADI) | 0.79 (0.76 to 0.82) | 67.39 (25.71) | 69.62 (23.01) | −2.23 (15.64) | −32.88 to 28.42 |
HAQ-DI = Health Assessment Questionnaire Disability Index; PF-10 = SF-36 physical functioning scale; ICC = intraclass correlation coefficient; LOA = Bland-Altman limits of agreement (mean difference ± 1.96×SD of the difference).