Results of Univariate Characteristics of the Prednisolone Test for COPD and Multivariate Analysis of Responder Characteristics
| Diagnostic Variables | OR (95% CI) | PPV % (95% CI) | NPV % (95% CI) | LR+ (95% CI) | LR− (95% CI) |
|---|---|---|---|---|---|
| Univariate analysis | |||||
| Responder | 2.4 (1.1–5.2) | 50 (33–67) | 70 (64–76) | 2.1 (1.1–4.1) | 0.9 (0.8–1.0) |
| Multivariate analysis | |||||
| Responder | 2.0 (0.8–5.0) | – | – | – | – |
| Age (per 5 y) | 1.4 (1.1–1.7) | – | – | – | – |
| Male | 2.3 (1.2–4.3) | – | – | – | – |
| Current smoking | 8.3 (4.0–17.2) | – | – | – | – |
CI=confidence interval; COPD = chronic obstructive pulmonary disease; LR+ = positive likelihood ratio; LR− = negative likelihood ratio; NPV = negative predictive value; OR = odds ratio; PPV = positive predictive value.
Note: The 14 patients with both asthma and COPD were included as patients with COPD in this analysis.