Results of the CFQ and associated likelihood ratios for each score
| CFQ SCORE | TOTAL (N = 996*), N (%) | PATIENTS WITH COPD†N = 205) N (%) | PATIENTS WITHOUT COPD†(N = 791), N (%) | LIKELIHOOD RATIO (95% CI) |
|---|---|---|---|---|
| 0 | 317 (31.8) | 45 (22.0) | 272 (34.4) | 0.64 (0.48–0.84) |
| 1 | 224 (22.5) | 34 (16.6) | 190 (24.0) | 0.69 (0.50–0.96) |
| 2 | 180 (18.1) | 38 (18.5) | 142 (18.0) | 1.03 (0.75–1.43) |
| 3 | 155 (15.6) | 45 (22.0) | 110 (13.9) | 1.58 (1.16–2.15) |
| 4 | 85 (8.5) | 27 (13.2) | 58 (7.3) | 1.80 (1.17–2.76) |
| 5 | 35 (3.5) | 16 (7.8) | 19 (2.4) | 3.25 (1.70–6.21) |
CFQ—case-finding questionnaire, CI—confidence interval, COPD—chronic obstructive pulmonary disease
↵* Of the 1003 participants, 7 provided technically unsatisfactory responses to the questions on the CFQ and their scores were excluded from further analysis.
↵† According to results of spirometry testing.