Table 5.

Sensitivity analysis: comparison of primary measures before (baseline) and after (outcome) addition of tiotropium

Variable	Baseline	Outcome	P-valuea
Exacerbations
≥1, n (%)	363 (39.1%)	274 (29.5%)	<0.001
Acute respiratory events
≥1, n (%)	567 (61.1%)	452 (48.7%)	<0.001

Notes: n=928;

^amarginal homogeneity test.