USA Today wrote a story about how the Swine flu was almost even with the dealth toll from the seasonal flu. This story is full of numbers ranging from ages, dealth tolls, hospitalizations, years and people infected with the flu.
To obtain all these numbers, the reporter would have to know how to access hosipital records and maybe find different studies about the death toll for the Swine and seasonal flu. He would have had to contact health officials, medical journals, health organizations and perhaps various researchers. There is a percent that either could have came from an analysis or one he had to calculae on his own.