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.

Table 2 Distribution of demographic and clinical findings by gender

Variables (coronal)	Pediatric, n = 753		P	Adult, n = 758		P
	Male, n = 371	Female, n = 382		Male, n = 384	Female, n = 374
Age (year)	13.1 ± 4.5	13.7 ± 4.1	0.055	53.4 ± 17.3	55.3 ± 17.4	0.117
Right-left main	74.6 ± 12.9	71.2 ± 13.9	0.001	71.9 ± 12.9	75.8 ± 14.7	< 0.001
R upper-intermedius	68.8 ± 11.9	70.5 ± 12.7	0.067	68.7 ± 13	68.2 ± 13.4	0.563
R middle-lower	37.2 ± 11.9	36.6 ± 12.5	0.568	42.1 ± 12.1	42.8 ± 12.4	0.435
L upper-lower	58.7 ± 13.3	58.9 ± 12.4	0.790	58.3 ± 11.9	57.5 ± 13.7	0.379

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.

Table 3 Relationship between age and angles

Variables (coronal)	r	P
Right-left main	0.064	0.014
R upper-intermedius	-0.098	<0.001
R middle-lower	0.167	<0.001
L upper-lower	-0.070	0.007

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.