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Results for “Fertilization rate”

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At least 289 records · Page 16Linked to original sources
PubMed1996

Fertility rates among lead workers and professional bus drivers: a comparative study.

We examined the relationship between lead exposure and fertility among men in a retrospective cohort study. Fertility (1981-1992) of lead-exposed workers was determined from birth certificate information and was compared with that of nonexposed workers. The exposed group consisted of 4256 reproductive-age male workers reported to the New York State Heavy Metals Registry. The comparison group consisted of a random sample of male bus drivers licensed in the state of New York; these men were frequency-matched by age and residence to the men who were exposed to lead. The actual number of births among lead workers was lower than the expected number of births for that group (standardized fertility ratio [SFR] = 0.88; 95% confidence interval [CI] = 0.81-0.95), especially among those who had elevated blood lead levels for longer than 5 years (SFR = 0.43; 95% confidence interval [CI]: = 0.31, 0.59). Even after adjusting for age, race, education, and residence, workers with > 5 years of exposure had reduced likelihood of fathering a child than those with a shorter period of exposure (relative risk, 0.38; 95% CI: 0.23, 0.61). Our study indicates that men with a long duration of lead exposure might have reduced fertility.

Adult↗
PubMed2006

Comparison of bovine- and recombinant human-derived hyaluronidase with regard to fertilization rates and embryo morphology in a sibling oocyte model: a prospective, blinded, randomized study.

The objective of the present study was to compare a traditionally used bovine-derived hyaluronidase (Hyase) with the newly developed recombinant human-derived enzyme product (Cumulase) in intracytoplasmic sperm injection (ICSI) procedures using a sibling oocyte model in a prospective randomized design. The results of the study demonstrate that Cumulase is safe and effective in an ICSI treatment program and can provide comparable if not improved parameters, including fertilization and embryo developmental rates.

Adult↗
PubMed1997

Factors affecting the most recent fertility rates in urban-rural Bangladesh.

This paper reports on a study which has been undertaken using data from the 1989 Bangladesh Fertility Survey (BFS) to determine the significance of influences on the probability of birth in the year preceding the survey. In the survey a total of 11905 ever-married women of reproductive age were asked a battery of questions relating to fertility aspects of women. Variables selected in this study were grouped into demographic, socio-economic, cultural and decision-making variables. Findings from the study indicate that the mother's age, whether contraception has ever been used, the death of a child at any time, whether the woman has ever worked, religion, region of residence, and female independence are the important covariates for explaining recent fertility in Bangladesh. Models are developed for the probabilities of a woman giving birth in urban and rural areas, dependent on her demographic and socio-economic conditions. Also developed are models for contraceptive use in urban-rural Bangladesh. This modelling contributes to a better understanding of fertility changes in Bangladesh and the differentials between urban and rural fertility. It is indicated that a continued fertility decline is likely.

Adolescent↗
PubMed1996

Morphometric epididymal epithelium analysis in obstructive azoospermic men: predictive values in fertilization rates.

PURPOSE: Our purpose was to determine the obstructed epididymal epithelium morphometric state and to elucidate the influence of morphometric parameters on the fertilizing ability of aspirated spermatozoa. METHODS: During MESA with IVF, epididymal tissue samples were carefully dissected, fixed, and prepared for morphometric analysis. The epithelium of the three regions was studied: head, body, and tail (when present). The total area/luminal area ratio, epithelium thickness, and stereocilium length were measured. RESULTS: We have found significant differences in the total area/luminal area ratio, epithelium thickness, and stereocilium length in obstructed epithelium length > 4 versus 0.5-2 cm (P < or = 0.01). Epithelium thickness and stereocilium length were significantly lower when no fertilization was observed in IVF. CONCLUSIONS: These results suggest that morphometric data of obstructed epididymis epithelium can be used as a means of explaining the failure of IVF with epididymal spermatozoa.

Cell Separation↗