Table 2 AIC scores for the Poisson, negative binomial and inverse Gaussian generalized additive model with log link function modeling the ILI incidence rate in association with PM_2.5 interacting with flu season, while adjusting for daily temperature, humidity, month and year effects. The PM_2.5 is lagged by 0, 1, 2, 3, 4, and 5 days prior to the ILI reporting date and lag01 (PM_2.5 averaged over the current day and the previous day), lag 02 (PM_2.5 averaged over the current day, the previous day and 2 days before the current day) and so on, up to mean lag05 (PM_2.5 averaged over the past 6 days)

From: Impact of ambient fine particulate matter (PM_2.5) exposure on the risk of influenza-like-illness: a time-series analysis in Beijing, China