Chromosomal studies on 934 induced abortuses of middle-aged pregnant women.
A total of 934 induced abortuses of middle-aged pregnant women (35-48 years old) were chromosomally surveyed. The mean gestational age was 7.6 +/- 2.0 (S.D.) weeks after the first day of the last menstrual period, and the mean maternal age was 39.6 +/- 2.7 (S.D.) years. There was a high incidence of chromosomally abnormal fetuses in induced abortions, which markedly increased with the advancing age of the women: 9.6% (40/418) for the 35-39-year-old age group, 20.7% (100/484) for the 40-44-year-old age group, and 43.8% (14/32) for the 45-48-year-old age group, averaging 16.5%.
Hoshi
N
N
Department of Obstetrics and Gynecology, Hokkaido University School of Medicine, Sapporo, Japan.
Yamagami
Y
Y
Hanatani
K
K
Tanaka
T
T
Fujimoto
S
S
D000028:Abortion, Induced; D000328:Adult; D002869:Chromosome Aberrations; D005260:Female; D006801:Humans; D007621:Karyotyping; D008423:Maternal Age; D008875:Middle Aged; D010298:Parity; D011247:Pregnancy; D012737:Sex Factors