Table 5 Positive predictive value, sensitivity and specificity of the two scoring systems Discriminative properties of two scoring systems for questionnaire responses compared with the majority expert opinion about whether the patients merit a trial of obstructive airways disease therapy.
Scoring system | 1. Four or more symptoms/risk factors | 2. Four or more symptoms/risk factors plus one marker of severity |
|---|---|---|
PPV % [95% CI] | 75.1 [68.6–82.3] | 82.3 [75.9–89.2] |
Sensitivity % [95% CI] | 50.3 [35.3–71.6] | 46.9 [33.0–66.8] |
Specificity % [95% CI] | 95.3 [94.0–96.7] | 97.1 [96.0–98.2] |