Detection of tracheal branching with computerized tomography: The relationship between the angles and age-gender

Table 1 Demographic and clinical characteristics

Variables (coronal)	Whole population, n = 1511	Pediatric group, n = 753	Adult group, n = 758	P
Age (year)	34.0 ± 24.0	13.4 ± 4.3	54.3 ± 17.3	< 0.001
Gender n (%)
Male	755 (50.0)	371 (49.3)	384 (50.7)	0.589
Female	756 (50.0)	382 (50.7)	374 (49.3)
Right-left main	73.3 ± 13.7	72.9 ± 13.5	73.8 ± 13.9	0.190
R upper-intermedius	69 ± 12.8	69.7 ± 12.4	68.4 ± 13.2	0.062
R middle-lower	39.7 ± 12.5	36.9 ± 12.2	42.4 ± 12.3	< 0.001
L upper-lower	58.4 ± 12.8	58.8 ± 12.8	57.9 ± 12.8	0.191

Numerical variables were expressed as mean ± SD; P < 0.05 shows statistical significance; R upper-intermedius: The angle of the right upper lobe bronchus and the right intermedius bronchus in the coronal plane; R middle-lower: The angle of the right middle lobe bronchus and the right lower lobe bronchus in the coronal plane; L upper-lower: The angle of the left upper lobe bronchus and the left upper lobe bronchus in the coronal plane.