Poliomyelitis (infantile paralysis)—Monthly medians of cases reported for the years for which data are available in the period 1913-1921, and number of cases reported in the median year.

Deaths registered as due to poliomyelitis (infantile paralysis), 1922.

Poliomyelitis (infantile paralysis)- Median number of cases reported per annum and indicated morbidity rates, 1913-1921; cases reported, deaths registered, and indicated morbidity, mortality, and fatality rates, 1922.