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Table 3 Reliability of the quality of life instrument QLICD-PU (n = 153 for α, n = 63 for r and ICC)

From: Development and validation of the peptic ulcer scale under the system of quality of life instruments for chronic diseases based on classical test theory and generalizability theory

Domains/facets (number of items) Internal consistency coefficient α Test–retest coefficient r Test–retest ICC (95% CI)
Physical function PHD (8) 0.79 0.89 0.89 (0.83–0.93)
Independence (3) 0.81 0.88 0.88 (0.82–0.93)
Appetite and Sleep (2) 0.49 0.74 0.74 (0.60–0.83)
Physical symptoms (3) 0.60 0.80 0.80 (0.69–0.87)
Psychological function PSD(11) 0.83 0.91 0.91 (0.86–0.95)
Cognition (2) 0.53 0.83 0.82 (0.72–0.89)
Anxiety (3) 0.69 0.83 0.83 (0.74–0.89)
Depression (3) 0.79 0.90 0.90 (0.83–0.94)
Self-consciousness (3) 0.70 0.94 0.94 (0.90–0.96)
Social function SOD(11) 0.62 0.77 0.77 (0.65–0.86)
Social support/security (6) 0.73 0.84 0.84 (0.75–0.90)
Social Effects (4) 0.63 0.74 0.73 (0.59–0.83)
Sexual Function (1) 0.84 0.84 (0.74–0.90)
Specific domain SPD (14) 0.73 0.80 0.80 (0.69–0.87)
Upper abdomen pain(4) 0.44 0.72 0.72 (0.57–0.82)
Acid regurgitation/salivation(2) 0.35 0.86 0.86 (0.77–0.91)
Hiccup (1) 0.84 0.84 (0.75–0.90)
Flatulent (1) 0.83 0.83 (0.73–0.89)
Changing in stool habit (1) 0.77 0.77 0.64–0.85
Effects of mental and life(5) 0.63 0.73 0.72 (0.58–0.82)
Total TOT(44) 0.89 0.89 (0.82–0.93)
  1. – not acceptable/suitable, ICC: intra-class correlation