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accuracy accurate acute nephritis age distribution Age period Area for Births birth-rate born Bright's disease causes of death causes of sickness Census Bureau cent cerebral hemorrhage chapter compared congenital debility crude death-rate decline Diarrhea Diarrhea and enteritis diphtheria disability error facts fatality rate figures foreign Foreign-born white higher important increase indicated infant deaths infant mortality Influenza Insurance Company measles method Metropolitan Life Insurance months morbidity morbidity rate mortality rates mortality statistics mothers native-born negroes nephritis nephritis and Bright's number of deaths nursing association obtained occupation occur Percentage physical defects physician pneumonia Premature birth preventable principal causes problem proportion Public Health Nurse pulmonary tuberculosis race ratio Raymond Pearl Registration Area reported specific death-rates standard statistical sample statistician still-births taken Test area theria tion total number Tuberculous meningitis typhoid fever ulation United States Registration urban and rural vital statistics white persons whole population workers York City