237 Low-dose-CT versus X-ray in patients suspected of pulmonary disease Table S3 Responders versus non-responders SF-12 questionnaire: baseline characteristicsa Characteristic SF-12 returned (n = 1720) SF-12 not returned (n = 698) Standardized difference Mean age (SD)b, y 59.8 (17.5) 56.9 (20.1) 0.2 Female sex 854 (49.7) 346 (49.6) 0.2 Comorbidity Charlson Comorbidity Indexc (IQR) 3.0 (1.0-5.0) 3.0 (1.0-5.0) Immunocompromised 392 (22.8) 139 (19.9) 7.2 Malignancy b 318 (18.5) 123 (17.6) 2.3 Diabetesb 320 (18.6) 155 (22.2) 8.9 Pulmonary disease Chronic obstructive pulmonary diseaseb 265 (15.4) 89 (12.8) 7.6 Asthma 180 (10.5) 70 (10.0) 1.4 Interstitial lung disease 42 (2.4) 15 (2.1) 2.0 Cystic fibrosis 22 (1.3) 6 (0.9) 4.1 Cardiac disease Myocardial infarctionb 248 (14.4) 80 (11.5) 8.8 Chronic cardiac failureb 136 (7.9) 60 (8.6) 2.5 Neurological diseaseb 201 (11.7) 88 (12.6) 2.8 Kidney diseaseb 149 (8.7) 74 (10.6) 6.6 Thromboembolic disease 140 (8.1) 59 (8.5) 1.1 SD: standard deviation, IQR: interquartile range a Values are numbers (percentages) unless otherwise specified. b Variables included in the Charlson Comorbidity Index c Charlson Comorbidity Index, excluding AIDS. Predicts 10-year survival in patients with multiple comorbidities 9
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