Fig. 2From: Risk factors for an acute exacerbation of idiopathic pulmonary fibrosisImpact of acute exacerbation on overall survival. There was a significant difference in survival between patients who experienced an acute exacerbation (median survival time, 2.8 years) and those who did not (median survival time, not calculable) (log-rank test, P < 0.001)Back to article page