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Table 4 The estimated variance components and percentage of variance for p × i design in G-study for four domains of quality of life instrument QLICP-CHD

From: Development and validation of the coronary heart disease scale under the system of quality of life instruments for chronic diseases QLICD-CHD: combinations of classical test theory and Generalizability theory

 

p(person)

i(item)

p * i(person*item)

Domain

Variance component

Percent (%)

Variance component

Percent (%)

Variance component

Percent (%)

PHD

0.50

28.30

0.08

4.48

1.20

67.22

PSD

0.59

42.20

0.15

10.87

0.65

46.93

SOD

0.21

11.76

0.25

14.33

1.30

73.91

SPD

0.26

17.45

0.16

10.74

1.07

71.81

  1. p: person effect, i: item effect, p × i: person-by-item interaction effect.