Table 2. Main reasons for critical care admission of study patients.

	n	%
Exacerbation of obstructive lung disease	22	15.4
Pneumonia	77	53.8
Heart failure/pulmonary edema	21	14.7
Exacerbation of interstitial lung disease	11	7.7
Pulmonary embolism	2	1.4
Malignancy*	10	7
*non-small-cell lung cancer, small-cell lung cancer, lymphoma, intrathoracic metastasis of colon cancer and breast cancer