Results from the square wave β model.

The lag is from the seasonal peak in RSV cases predicted by the model to the start of the square wave. Lag and φ are in days. The values of λ, γ, σ, ν1 and ν2 are rates per day. Res is the residuals following fitting the model to the observed RSV data (the square root of the sum of the squares of the difference between the monthly number of observed RSV cases and the monthly number of RSV cases predicted by the model).