United States : 1950-67 Chase, Helen C. creator author. Byrnes, Mary E. author. National Center for Health Statistics (U.S.) issuing body. text bibliography Statistics. Statistics-Medical. Statistics. mdu 1972 monographic eng 1 online resource (iv, 51 pages) : illustrations. Helen C. Chase and Mary E. Byrnes. "January 1972." "An analysis of the trend in live births registered in the United States, 1950-67 by weight at birth and period of gestation, including an assessment of the quality of the data. Other factors, such as age of mother, plurality, sex, and delivery in hospitals are included insofar as they have a bearing on the trends." CRDP Program record. Includes bibliographical references (pages 30-32). n-us--- Premature infants United States Statistics Birth weight United States Statistics Newborn infants United States Statistics United States Statistics, Medical Premature infants United States HE 20.2210:3/15 HE 20.2210:3/15 Chase, Helen C. (DLC) 70610274 (OCoLC)969085345 Series 3 Analytical studies https://purl.fdlp.gov/GPO/gpo117210 https://purl.fdlp.gov/GPO/gpo117210 SXT 110419 20190831111941.0 on1015670083 eng