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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.