Fig. 1.

The proportion of patients with abnormal pulmonary function tests comparing ICU and non-ICU cohorts. Abnormal pulmonary function tests (PFT) are defined as < 80% predicted value for FEV1, FVC, and TLCO. Comparison is made between intensive care unit (ICU) patients and those non-ICU patients who required follow-up investigations. Not all PFTs were completed for all patients. The number of patients completing each test is shown under the appropriate bars. Statistical significance is measured using Fisher’s exact test and a p value of < 0.05 is denoted as statistically significant. NS not significant, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, TLCO diffusion capacity for carbon monoxide