TY - JOUR
T1 - Increased incidence of high-order and singleton conceptions after ovulation induction in winter
AU - Lipitz, S.
AU - Bider, D.
AU - Alcalay, M.
AU - Dan, U.
AU - Goldenberg, M.
AU - Mashiach, S.
PY - 1994/4
Y1 - 1994/4
N2 - The possible relationship between the season of conception after ovulation induction and high-order multifetal pregnancies, was investigated. From 1975 to 1989, 111 high-order multiple births after ovulation induction were recorded at the Chaim Sheba Medical Center. This group was compared with 142 singleton pregnancies that resulted from induction of ovulation during 1989. Composite monthly cohorts of high-order multifetal pregnancies were constructed for each month of the year, and the probability of such pregnancies was estimated. The period of ovulation induction and the day of presumed conception were noted. A statistically-significant increase in the probability of high-order and singleton conceptions occurred during the winter. Our observation indicates a seasonal pattern in high order and singleton conceptions after ovulation induction.
AB - The possible relationship between the season of conception after ovulation induction and high-order multifetal pregnancies, was investigated. From 1975 to 1989, 111 high-order multiple births after ovulation induction were recorded at the Chaim Sheba Medical Center. This group was compared with 142 singleton pregnancies that resulted from induction of ovulation during 1989. Composite monthly cohorts of high-order multifetal pregnancies were constructed for each month of the year, and the probability of such pregnancies was estimated. The period of ovulation induction and the day of presumed conception were noted. A statistically-significant increase in the probability of high-order and singleton conceptions occurred during the winter. Our observation indicates a seasonal pattern in high order and singleton conceptions after ovulation induction.
KW - High-order multifetal pregnancy
KW - Winter
UR - http://www.scopus.com/inward/record.url?scp=0028245158&partnerID=8YFLogxK
U2 - 10.1016/0028-2243(94)90251-8
DO - 10.1016/0028-2243(94)90251-8
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
C2 - 8070596
AN - SCOPUS:0028245158
SN - 0028-2243
VL - 54
SP - 127
EP - 129
JO - European Journal of Obstetrics and Gynecology and Reproductive Biology
JF - European Journal of Obstetrics and Gynecology and Reproductive Biology
IS - 2
ER -