Table 1.

General characteristics of 3525 patients included in the analysis.

Total, N	3525
Demographic characteristics
Male, N (%)	1881 (53.4)
Female, N (%)	1644 (46.6)
Age, years, median (IQR)	3.3 (2.7–4.9)
Age category
Neonates (birth–28 days), N (%)	377 (10.7)
Infant (29 days–12 months), N (%)	770 (21.8)
Toddler (13 months–2 years), N (%)	405 (11.5)
Early childhood (2.1–5 years), N (%)	1028 (29.2)
Middle childhood (6–11 years), N (%)	579 (16.4)
Adolescence (12–18 years), N (%)	366 (10.4)
Sample type
Nasopharyngeal aspirate, N (%)	2406 (68.3)
Nasopharyngeal swab, N (%)	1089 (30.9)
Bronchoalveolar lavage, N (%)	30 (0.85)

IQR, interquartile range.