Table 3.

Radiographic features by age group

Variable (n, %)	0– < 5 years N = 40	5– < 9 years N = 29	9–18 years N = 37	Total N = 106	p-value
Density category
Ground-glass opacity	3 (7.5%)	4 (13.8%)	19 (51.4%)	26 (24.5%)	< 0.001*
Patchy opacity	1 (2.5%)	1 (3.5%)	2 (5.4%)	4 (3.8%)	0.832
Peribronchial thickening	25 (62.5%)	19 (65.5%)	10 (27%)	54 (51%)	0.001*
Reticulonodular infiltration	2 (5%)	1 (3.4%)	0 (0%)	3 (2.8%)	0.49
Mixed	9 (22.5%)	4 (13.8%)	6 (16.2%)	19 (17.9%)	0.613
Lung involvement
Peripheral zone	0 (0%)	2 (6.9%)	9 (24.3%)	11 (10.4%)	< 0.001*
Perihilar zone	6 (15%)	3 (10.3%)	2 (5.4%)	11 (10.4%)	0.478
Neither peripheral nor perihilar	34 (85%)	24 (82.8%)	26 (70.3%)	84 (79.2%)	0.242
CXR reporting (N = 106)
Typical	5 (12.5%)	1 (3.4%)	7 (18.9%)	13 (12.3%)	0.164
Indeterminate	35 (87.5%)	27 (93.2%)	30 (81.1%)	92 (86.8%)	0.393
Atypical	0 (0%)	1 (3.4%)	0 (0%)	1 (0.9%)	0.274
Severity score of abnormal CXR images					0.231
Mild (score, 1–2), n (%)	28 (70%)	23 (79.3%)	30 (81.1%)	81 (76.4%)
Moderate (score, 3–4), n (%)	8 (20%)	6 (20.7%)	7 (18.9%)	21 (19.8%)
Severe (score, 5–6), n (%)	4 (10%)	0 (0%)	0 (0%)	4 (3.8%)

CXR Chest radiography

^* Statistical significance p-value ≤ 0.05