Figure 2.

Key features for summarizing and comparing seasonality. PTR, peak-to-trough ratio; AF, attributable fraction; RR (r$\mathrm{elative}\mathrm{ }\mathrm{r}\mathrm{i}\mathrm{s}\mathrm{k})=\frac{Mortality\mathrm{ }estimate\mathrm{ }on\mathrm{ }the\mathrm{ }day-of-year\mathrm{ }x}{Minimum\mathrm{ }mortality\mathrm{ }estimate\mathrm{ }at\mathrm{ }the\mathrm{ }trough}$. △PTR (change in PTR after adjustment) =$\mathrm{ }\exp \left(\log \left({PTR}_{after}\right)-\log \left({PTR}_{before}\right)\right)$; △AF (change in AF after adjustment) = ${AF}_{after}-{AF}_{before}$