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Data Employed and Their Limitations
Summary and Conclusions
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amplitude cause of death cd cd cd H Cities index Cities Other Pennsylvania Column cycle cyclical elements Deaths from Diarrhea Deaths from Influenza Deaths from Pulmonary Deaths from Scarlet Deaths from Whooping December diarrhea and enteritis difference method Difference Seasonal Indexes duration of peak earlier period Epidemic Cerebrospinal Meningitis H rH hypothetical series I-II Cities index figures Indexes of Deaths Indexes of Whooping irregular January June later period March significant measles monthly average monthly figures morbidity moving average method moving total November number of deaths O-MA O/MA values occurred October peak and trough peak months Pennsylvania group Pennsylvania index Pennsylvania section percent Philadelphia and Pittsburgh positional averages procedure Pulmonary Tuberculosis relatives reported rH O rH rH rH rH scarlet fever seasonal influence seasonal picture significant if grouped summer peak Table total deaths trough months whooping cough zero line