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Table 6 Reliability, floor and ceiling effects of the quality of life instrument QLICD-PT (n = 200)

From: Development and validation of the pulmonary tuberculosis scale of the system of Quality of Life Instruments for Chronic Diseases (QLICD-PT)

Domains/facets Internal consistency Coefficient α Floor effects (%) Ceiling effects (%)
Physical domain (PHD) 0.78 0.0 0.5
 Basic physiologic functions (BPF) 0.50 0.0 1.0
 Independence (IND) 0.83 0.5 48.5
 Energy and discomfort (EAD) 0.51 1.0 3.0
Psychological domain (PSD) 0.81 0.0 0.5
 Cognition (COG) 0.55 0.0 13.0
 Emotion (EMO) 0.74 0.0 0.5
 Will and personality (WIP) 0.20 0.0 17.5
Social domain (SOD) 0.72 0.0 2.0
 Interpersonal communication (INC) 0.61 0.0 11.5
 Social support and security (SSS) 0.42 0.0 4.5
 Social role (SOR) 0.30 1.5 14.5
Sub-total (QLICD-GM) 0.89 0.0 0.0
Specific domain (SPD) 0.78 0.0 0.0
 Respiratory symptom (RES) 0.80 0.5 1.5
 Constitutional symptom (COS) 0.26 0.0 1.0
 Drug side-effects (DSE) 2.0 53.0
 Special mention (SPM) 0.62 5.5 5.5
Total (TOT) 0.90 0.0 0.0
  1. -not acceptable/suitable