Table 3.

Comorbidities of patients with SP

	15–34 years		35–64 years		≥65 years		Total
	n	%*	n	%†	n	%‡	n	%§
Total	2407		1374		497		4658
COPD	273	11.3	277	20.2	287	57.7	837	18.0
Pneumonia	102	4.2	109	7.9	150	30.2	361	7.8
Interstitial	4	0.2	17	1.2	13	2.6	34	0.7
Lung cancer	11	0.5	72	5.2	67	13.5	150	3.2
Asthma	63	2.6	111	8.1	174	35.0	348	7.5
Lung abscess	1	0.0	8	0.6	0	0.0	9	0.2
CCI
Mean	0.25		0.69		1.31		0.47
0	1823	75.7	708	51.5	173	34.8	2704	58.1
1	468	19.4	420	30.6	305	61.4	1193	25.6
2	45	1.9	165	12.0	166	33.4	376	8.1
3 or more	5	0.2	65	4.7	99	19.9	159	3.4

*%=n/2407×100.

†%=n/1374×100.

‡%=n/496×100.

§%=n/4658×100.

CCI, Charlson Comorbidity Index; COPD, chronic obstructive pulmonary disease; SP, spontaneous pneumothorax.