. Author manuscript; available in PMC: 2016 Jun 1.

Published in final edited form as: Pediatr Infect Dis J. 2015 Jun;34(6):566–570. doi: 10.1097/INF.0000000000000596

Table 2.

Demographic characteristics in infants less than 6 months old hospitalized with bronchiolitis by Centers for Disease Control and Prevention (CDC) clinical case definition for probable pertussis

Characteristics	B. pertussis negative (n=1351)	B. pertussis probable, but not confirmed (n=50)	B. pertussis confirmed (n=4)
Age in months, median (IQR)	2 (1–4)	4 (2–5)	4 (2–3)
<2	618 (46%)	8 (16%)	2 (50%)
2–3.9	452 (33%)	15 (30%)	2 (50%)
4–5.9	281 (21%)	27 (54%)	0 (0%)

Sex
Male	783 (58%)	33 (66%)	3 (75%)
Female	568 (42%)	17 (34%)	1 (25%)

Race & ethnicity
White	868 (64%)	21 (42%)	3 (75%)
Black	297 (22%)	16 (32%)	0 (0%)
Other or missing	186 (14%)	13 (26%)	1 (25%)
Hispanic	470 (35%)	22 (44%)	2 (50%)

Abbreviations: IQR - interquartile range