Odds ratios and 95% confidence intervals for the effects of the listed factors on H1N1v swab positivity among patients under 65 who were swabbed as part of the Scottish Sentinel Swabbing Scheme.

The swabs were all collected between October 1st 2009 and 31st January 2010. Three different models were used to control for the temporal trend – a spline trend within a generalised additive model (GAM) for the weekly temporal trend; a quadratic trend; and a factor with 4 levels representing the 4 four week period.