Figure 1.

Overlap between FSC and TIO (top graph) and FSC and IPR (bottom graph) groups for calculated probability to receive TIO or IPR treatment.

Notes: Probability was calculated using logistic regression and adjusted for baseline covariates. The large intersection of the TIO and FSC distributions (89.1% of TIO patients matched) and IPR and FSC distributions (80.2% of IPR patients matched) indicates a high degree of similarity on the measured attributes.

Abbreviations: FSC, fluticasone propionate/salmeterol combination; IPR, ipratropium; TIO, tiotropium.