Correcting for day of the week and public holiday effects: improving a national daily syndromic surveillance service for detecting public health threats

Table 1 Scaling factors for indicators from the GP in-hours syndromic surveillance system for the extended working day moving average

	Scaling factors: severe asthma	Scaling factors: gastroenteritis
Monday	1.30	1.25
Tuesday	0.95	0.95
Wednesday	0.91	0.91
Thursday	0.87	0.90
Friday	0.93	0.95
Saturday	0.03	0.02
Sunday	0.01	0.01
Public holiday	0.01	0.01
First working day after public holiday	1.30	1.25

The scaling factors for the extended working day moving average for Monday – Sunday were based on 52 weeks of data (13th January 2014 - 11th January 2015) using the method outlined in the main text. The scaling factors for public holidays and their surrounding days were based on observations made of the GP in-hours syndromic surveillance system over multiple years

ISSN: 1471-2458