Table 1.

Characteristics of Patients with Complete and Incomplete Fissures

	Left Major Fissure			Right Major Fissure			Right Minor Fissure
	Incomplete (<95%)	Complete (⩾95%)	P Value	Incomplete (<95%)	Complete (⩾95%)	P Value	Incomplete (<95%)	Complete (⩾95%)	P Value
Age (n = 9,926), y	59.8	59.5	0.12	59.8	59.2	<0.001	59.8	58.4	<0.001
Sex (n = 9,926), M:F, %	45.1:54.9	47.8:52.2	0.01	45.5:54.5	49.0:51.0	<0.001	46.7:53.3	47.7:52.3	0.50
Race, (n = 9,926), non-Hispanic White:African American, %	74.8:25.2	64.0:36.0	<0.001	73.2:26.8	59.4:40.6	<0.001	71.7:28.3	45.5:54.5	<0.001
Pack-years (n = 9,924)	42.4	42.0	0.46	42.6	41.4	0.02	42.3	41.2	0.13
COPD:no COPD (n = 9,866), %	43.3:56.7	42.0:58.0	0.22	43.3:56.7	41.1:58.9	0.04	42.8:57.2	40.4:59.6	0.08
FEV1% predicted	77.8	77.8	0.87	78.0	77.5	0.38	77.8	77.8	0.97
Emphysema (n = 9,926), ⩽30%:>30%, %	95.6:4.4	95.3:4.7	0.52	95.5:4.5	95.4:4.6	0.82	95.3:4.7	96.1:3.9	0.19
Maternal smoking during pregnancy, (n = 5,532), yes:no, %	29.4:70.6	30.8:69.2	0.24	30.2:69.8	30.5:69.5	0.77	30.5:69.5	29.3:70.7	0.45
Maternal COPD, (n = 5,532), yes:no, %	8.8:91.2	9.4:90.6	0.35	9.0:91.0	9.5:90.5	0.41	9.0:91.0	10.2:89.8	0.20

Definition of abbreviation: COPD = chronic obstructive pulmonary disease.

Complete fissures are defined as fissure integrities ⩾95%. Age is presented as median. Student's t tests and χ² tests were performed to test for statistically significant differences between the groups.