1. A: Optimal cutoff point (circled) at which visual analog scale score categorizes subjects with versus those without bronchial obstruction.
A: Optimal cutoff point (circled) at which visual analog scale score categorizes subjects with versus those without bronchial obstruction. Area under the curve = 0.71 (CI: 0.64–0.79). B: Frequency of distribution of visual analogue scale scores in subjects with and without bronchial obstruction.
Giorgio Ciprandi et al. Respir Care 2016;61:23-29
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