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Table 3 Reliability of the quality of life instrument QLICD-CHD (n = 146 for α, n = 50 for r and ICC)

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

Domains/Facets Internal consistency coefficient α Test-retest reliability correlation coefficient r Test-retest reliability ICC (95% CI )
Physical domain (PHD) 0.76 0.95 0.95 (0.91-0.97)
Independence 0.70 0.98 0.98 (0.97-0.99)
Appetite and sleep 0.46 0.77 0.77 (0.62-0.86)
Physical Symptoms 0.67 0.97 0.98 (0.96-0.99)
Psychological domain (PSD) 0.90 0.92 0.92 (0.86-0.95)
Cognition 0.73 0.92 0.92 (0.87-0.96)
Anxiety 0.81 0.85 0.84 (0.74-0.91)
Depression 0.84 0.93 0.93 (0.88-0.96)
Self-consciousness 0.76 0.91 0.91 (0.84-0.95)
Social domain (SOD) 0.63 0.86 0.85 (0.75-0.91)
Social Support/Security 0.74 0.84 0.83 (0.71-0.90)
Social Effects 0.75 0.92 0.91 (0.85-0.95)
Sexual function - 0.94 0.96 (0.94-0.98)
Sub-total (QLICD-GM) - 0.92 0.92 (0.86-0.95)
Specific domain (SPD) 0.79 0.80 0.80 (0.68-0.88)
Symptom 0.78 0.70 0.72 (0.54-0.73)
Effect of medicine - 0.61 0.61 (0.40-0.76)
Effect on mental health and daily life 0.65 0.89 0.92 (0.86-0.95)
Total (TOT) - 0.90 0.91 (0.84-0.95)
  1. - not acceptable/suitable, ICC: intra-class correlation, CI: confidence interval.