Relationship between the population incidence of pertussis in children in New South Wales, Australia and emergency department visits with cough: a time series analysis

Table 2 Daily counts of emergency department (ED) visits and disease notifications: measures of central tendency and variation ¹

	Median	Mean	Standard deviation	Range	Inter-quartile range
Cough ED visits	26	26.9	11.7	77.0	15.0
Pertussis notifications	5	8.4	10.0	54.0	11.0
Influenza notifications	2	12.1	40.6	416.0	6.0
Bronchiolitis ED visits	20	22.0	12.2	68.0	18.0

1. Data sources: ED data were obtained from the New South Wales Emergency Department Data Collection. Disease notifications data were obtained from the New South Wales Notifiable Conditions Information Management System. Study period: 1 January 2007–31 December 2010. Study population: New South Wales children aged under 10 years.

ISSN: 1472-6947