Seroprevalence of Bordetella pertussis specific Immunoglobulin G antibody levels among asymptomatic individuals aged 4 to 24 years: a descriptive cross sectional study from Sri Lanka

Table 3 Factors associated with anti-PT levels

Associated factors		No.	Median anti-PT level (IU/ml)	P* value
Gender	Girl	212	4.6367	<0.003
Gender	Boy	173	2.5013	<0.003
Having a sibling aged more than >12 years	Yes	176	4.840	0.017
Having a sibling aged more than >12 years	No	209	2.7654	0.017
Exposure to either active or passive smoking	Yes	27	2.50	0.882
Exposure to either active or passive smoking	No	358		0.882

ISSN: 1471-2334