Skip to main content

Table 2 Scores of the AQLQ and the SF-36 in individuals with asthma from a general population

From: Comparing a disease-specific and a generic health-related quality of life instrument in subjects with asthma from the general population

Instrument Number of items Median scores (25th to 75th percentile) Floor and ceiling effects Internal consistency reliability
    % scores 1–2 % scores 6–7 Cronbach alpha Corrected item total correlations Inter-item correlation
AQLQ (n = 258)        
Symptoms 11 6.38 (5.33–6.92) 0.4 72.1 0.92 0.47–0.86 0.22–0.89
Activity limitation 12 6.36 (5.64–6.91) 0.4 60.9 0.95 0.64–0.86 0.40–0.79
Emotional function 5 6.80 (5.80–7.00) 0.4 64.0 0.84 0.53–0.76 0.37–0.70
Environmental exposure 4 6.50 (5.25–7.00) 0.4 66.7 0.77 0.50–0.64 0.34–0.56
    % scores 0–10 % scores 90–100    
SF-36 (n = 216)        
Physical functioning 10 90.0 (75.0–100.0) 2.3 54.8 0.92 0.57–0.81 0.30–0.82
Role physical 4 100.0 (50.0–100.0) 10.4 66.0 0.86 0.69–0.73 0.57–0.64
Bodily pain 2 84.0 (51.0–100.0) 1.4 41.7 0.93 0.88 0.88
General health 5 58.8 (50.0–69.1) 0.5 0.5 0.77 0.38–0.71 0.22–0.66
Vitality 4 60.0 (45.0–70.0) 2.8 3.7 0.88 0.71–0.79 0.51–0.78
Social functioning 2 87.5 (62.5–100.0) 0.5 46.3 0.80 0.74 0.74
Role emotional 3 100.0 (66.7–100.0) 10.3 68.7 0.78 0.55–0.67 0.48–0.65
Mental health 5 76.0 (60.0–84.0) 0.5 11.6 0.88 0.66–0.78 0.46–0.75
Physical component score   52.4.(44.1–56.4)      
Mental component score   50.8 (41.8–54.2)      
  1. AQLQ: Asthma quality of life questionnaire; SF-36: Short-form 36 questionnaire