Table 2 Long-term exacerbation rate. Long-term (months 3–12) exacerbation rate in all patients, based on cut-points of ≥2, ≥6, and ≥10 reliever inhalations/day in the week preceding the 2-month visit
From: Reliever salbutamol use as a measure of exacerbation risk in chronic obstructive pulmonary disease
Mean reliever use (inhalations/day) | Exacerbation ratea or ratio | 95 % CI | P-value |
|---|---|---|---|
<2 | 0.596 | (0.470, 0.756) | |
2–5 | 0.724 | (0.594, 0.882) | |
6–9 | 0.996 | (0.806, 1.230) | |
≥10 | 1.403 | (1.115, 1.766) | |
2–5 versus <2 | 1.214 | (0.891, 1.654) | 0.22 |
6–9 versus <2 | 1.670 | (1.215, 2.296) | 0.0016 |
≥10 versus <2 | 2.353 | (1.687, 3.282) | <0.001 |