Figure 3.
Natural history of COPD in a cohort of 73,106 patients after first hospitalization for a severe exacerbation, showing (A) rate of next severe exacerbation and (B) rate of next severe exacerbation or death per 10,000 patients per day.3
Notes: Time between successive events estimated using the median inter-exacerbation times conditional on survival with death as a competing risk (A), or the median inter-exacerbation times as time to next exacerbation or death, whichever occurred first. Reproduced from Thorax, Suissa S, Dell’Aniello S, Ernst P, Volume 67(11), pages 957–963, copyright 2012 with permission from BMJ Publishing Group Ltd.3