Table 5.
Effect of Urbanization on the Optimum Cut-off Scores, AUC and Validity of the Two Screening Questionnaires
| Rural | Urban | |||||||
|---|---|---|---|---|---|---|---|---|
| Optimum Cut-off | AUC | Sensitivity (%) | Specificity (%) | Optimum Cut-off | AUC | Sensitivity (%) | Specificity (%) | |
| Spirometry-defined COPD | ||||||||
| COPD-PS | 5 | 0.653 | 42.5 | 88.1 | 4 | 0.720 | 63.3 | 80.8 |
| COPD-SQ | 16 | 0.700 | 65.0 | 74.9 | 13 | 0.734 | 67.3 | 79.4 |
| Symptomatic COPD | ||||||||
| COPD-PS | 5 | 0.725 | 56.7 | 88.4 | 4 | 0.792 | 78.1 | 80.2 |
| COPD-SQ | 16 | 0.766 | 78.3 | 74.9 | 15 | 0.808 | 71.9 | 89.7 |
Abbreviations: COPD, chronic obstructive pulmonary disease; COPD-PS, chronic obstructive pulmonary disease population screener; COPD-SQ, chronic obstructive pulmonary disease screening questionnaire; AUC, area under the receiver operating characteristic curve.