S E Jewell1, R Yip. 1. Division of Nutrition, Centers for Disease Control and Prevention, Atlanta, Georgia.
Abstract
OBJECTIVE: To determine the nature and possible reasons for the increasing trend in plural births in the United States during the 1980s. METHODS: We performed a descriptive analysis of births in the United States for five racial and ethnic groups from 1980-1989, using the United States vital records natality files. RESULTS: The rates of twin and triplet births rose 19 and 100%, respectively, during the 1980s. Approximately one-fourth of the observed increases can be attributed to rising maternal age. The increases in twin and triplet births occurred mainly among more educated and older white women. CONCLUSION: The association of high education status with rising rates of plural births, independent of maternal age, suggests that the observed increase is the result of increasing use of fertility-stimulating therapy among a subset of the childbearing population.
OBJECTIVE: To determine the nature and possible reasons for the increasing trend in plural births in the United States during the 1980s. METHODS: We performed a descriptive analysis of births in the United States for five racial and ethnic groups from 1980-1989, using the United States vital records natality files. RESULTS: The rates of twin and triplet births rose 19 and 100%, respectively, during the 1980s. Approximately one-fourth of the observed increases can be attributed to rising maternal age. The increases in twin and triplet births occurred mainly among more educated and older white women. CONCLUSION: The association of high education status with rising rates of plural births, independent of maternal age, suggests that the observed increase is the result of increasing use of fertility-stimulating therapy among a subset of the childbearing population.
Authors: Hye Jin Cho; Joong Sik Shin; Jae Hyug Yang; Hyun Mee Ryu; Moon Young Kim; Jung Yeol Han; Joo Oh Kim; Hyun Kyong Ahn; June Seek Choi; Jin Hoon Chung; Su Hyun Park; Min Hyoung Kim; Kyu Hong Choi Journal: J Korean Med Sci Date: 2006-06 Impact factor: 2.153
Authors: K Kleinhaus; M C Perrin; O Manor; Y Friedlander; R Calderon-Margalit; S Harlap; D Malaspina Journal: Eur J Obstet Gynecol Reprod Biol Date: 2008-09-03 Impact factor: 2.435