Fertility-Rates After Oral Contraceptives

Jongbloet, P.H.; Zwets, J.H.J

doi:10.1016/s0140-6736(76)92322-9

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…According to recent reports, there is an increased incidence of chromosome abnormalities in products of conception resulting from fertilizations that follow shortly after the discontinuation of oral contraceptive steroids (10,13,15,49). It has been postulated that the transition from anovulation to normal reproductive function may be accompanied by cycles with ovulatory and luteal phase defects.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Maternal Age, Parity, Fetal Sex and Season upon Early Intrauterine Development

Iffy¹,

Lavenhar

Kaminetzky³

et al. 1978

Intl J Gynecology & Obste

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This report presents the results of a computer analysis of 1672 specimens of embryonic material which were obtained by induced abortion in normal pregnancies. The study was undertaken to evaluate the effect of maternal age, parity, fetal sex and seasonal variations on the growth rate of embryos and fetuses which were between six and 20 weeks' gestation. Two parameters of intrauterine growth were analyzed: (a) the relation between menstrual age and crown‐to‐rump length and (b) the crown‐to‐rump length versus the body weight ratio. None of the quoted factors seemed to affect the linear growth of the embryo or fetus. The correlations between fetal crown‐to‐rump length and body weight were not influenced by maternal age, parity or fetal sex. Significant (p < 0.001) differences in early intrauterine growth rates were detected in relation to the season of conception. The rate of increase of body weight was far above average in those embryos and fetuses conceived during the summer months, while the opposite was the case when the conception occurred in the fall. An increase in the rate of the weight gain was demonstrated among the products of conceptions which occurred in the winter. There were insufficient data about those fetuses that resulted from conceptions which occurred in the spring.

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Section: Discussionmentioning

confidence: 99%

The Effect of Maternal Age, Parity, Fetal Sex and Season upon Early Intrauterine Development

Iffy¹,

Lavenhar

Kaminetzky³

et al. 1978

Intl J Gynecology & Obste

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Down syndrome: increased frequency of maternal meiosis I nondisjunction during the transitional stages of the ovulatory seasons

Jongbloet

Vrieze

1985

Hum Genet

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In a month-of-birth study of Down syndrome (DS) individuals, we found--in agreement with a previous collaborative European study (Jongbloet et al. 1982)--a distribution of maternal meiosis I (Mat MI)-DS births, both graphically and statistically differing from that of both total births (P less than 0.05) and from that of the three other (Mat MII + Pat MI + Pat MII)-DS subcategories (P less than 0.001). In four subgroups, namely the DS individuals born in the years 1960-1979 and 1980-1983 and those from mothers less than or equal to 30 years, and greater than or equal to 31 years, analogous results were found. In addition, the Mat MI-DS individuals were shown to have been conceived more frequently during the "strong" change rate periods. i.e. the transitional stages of ovulatory breakthrough and breakdown, and less during the "weak" change rate periods, i.e. the periods of a rather stable ovulatory rate (P less than 0.05). The same results were found in two subgroups of individuals born 1960-1970 (P less than 0.055) and from mothers greater than or equal to 31 years (P less than 0.02). This interdependence estimated by linear regression in the total group (rs = 0.503; P less than 0.055) and in the subgroup greater than or equal to 31 years (rs = 0.556; P less than 0.05), supports the hypothesis that Mat MI nondisjunctions occur more frequently during the transitional stages of the ovulatory seasons, i.e. they are caused by seasonal pre-ovulatory overripeness ovopathy (SPOO).

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Influence of melatonin and photoperiod on animal and human reproduction

Cagnacci¹,

Volpe²

1996

J Endocrinol Invest

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Fertility-Rates After Oral Contraceptives

Cited by 3 publications

References 9 publications

The Effect of Maternal Age, Parity, Fetal Sex and Season upon Early Intrauterine Development

The Effect of Maternal Age, Parity, Fetal Sex and Season upon Early Intrauterine Development

Down syndrome: increased frequency of maternal meiosis I nondisjunction during the transitional stages of the ovulatory seasons

Influence of melatonin and photoperiod on animal and human reproduction

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