Search Results for Conception Rate

...Thomas W. Pullum; Stephen J. Williams Abstract A method for estimating conception rates, using vital statistics data, is developed and applied to data on five-year age groups of California women for 1971. The approach is deterministic and allocates total exposure time to the known pregnancy...

...Jane Menken Abstract Seasonal patterns in conception rates have been documented in several recent studies. In this paper, a mathematical model of the reproductive process is developed through which the impact of such variation in conception rates is assessed. It is found that the effect...

... between education and nonmarital childbearing has remained stable: the least-educated women have the highest birth rates within cohabitation and as single mothers, primarily because of their lower probability of legitimating a nonmarital conception. These findings suggest that nonmarital childbearing...

...; and for the highest socioeconomic quintile census tracts, Baltimore, 1952–56. However, shifting the birth rates back forty weeks to approximate conception dates revealed no association with the observed coital rates. If the pattern presented has great generality, seasonal variations in births cannot be explained...

... contribution of each contraceptive method to the total dura- tion of contraceptive protection by calendar year were calculated. Crude conception rates per 100 woman-years were estimated for all never-married sexually exposed women and for the sexually active only. Periods of natural protection were excluded...

... of the estimators is outlined. The model is applied to four sets of data. 26 1 2011 © Population Association of America 1976 1976 Live Birth Maximum Likelihood Estimator Percent Level Conception Rate Continuous Time Model References Jain A. K. ( 1969 ). Fecundability and Its...

... to characteristics of the distribution channels. 13 1 2011 © Population Association of America 1996 1996 Family Planning Total Fertility Rate Family Planning Program Conception Rate Supply Source References Akin J. , & Schwartz J.B. ( 1986 ). The Effect of Economic...

..., abortion, and coital behavior. The natural fertility paradigm thus is insufficient in explaining the motivation for this behavior and should be complemented by institutional approaches. 12 1 2011 © Population Association of America 1993 1993 Baby Boom Abortion Rate Conception Rate...

... by shifting conceptions to later months. Second, we investigate whether the critical exposure period occurs before or at the estimated time of conception, shedding light on the channel through which high temperatures affect birth rates. The potential for climate change to increase the frequency of extreme...

... of anovulatory length regarded as most realistic, the penalty of early insertion in terms of reduced postponement of next conception proves consistently small. 30 12 2010 © Population Association of America 1971 1971 Discontinuation Rate Family Planning Program Insertion Time Anovulation...

...James Trussell; Linda G. Martin; Robert Feldman; James A. Palmore; Mercedes Concepcion; Datin Noor Laily Bt. Dato’ Abu Bakar 9 1 2011 © Population Association of America 1985 1985 Life Table Birth Order Birth Interval Conception Rate Fertility Survey References...

... family formation age ( younger age group ). After a conception leading to the birth of the first child, short-distance relocations occur at a higher rate for both younger and older individuals. The intention to have another child spurs relocations over any distance among older respondents...

..., which was taken from the United Nations study The Concept of a Stable Population . Period life tables and vital rates for intercensal periods were generated from the new estimates of the black population at each census date. The results of this study are highly compatible both with the life tables...

...David D. McFarland Abstract Expositions and elementary proofs are given for the basic theorems of stable population theory: That a population subjected to vital rates (not necessarily constant over time) satisfying certain postulates will eventually “forget” its original age distribution and take...

... fertility rate, perhaps reflecting an increased likelihood that a premarital conception will be legitimated. Marriage opportunities also reduce nonmarital fertility ratios for young black and white women. The nonmarital fertility rate is lower among women whose marriage pool includes a large percentage...

..., which are then contrasted with subsequent mobility. Past mobility, plan, choice, and the life cycle account for approximately 80 percent of the possible subsequent mobility-rate variation for the Los Angeles metropolis. For the time period and indexes, the greatest relative contributions to subsequent...

... depend on husband’s wage rate or wife’s education or potential wage rate. This indicates that many microeconomic models of fertility have been seriously misspecified. The paper also compares results from static and dynamic models, explores possible problems due to simultaneity bias, investigates...

... groups in Copenhagen (but especially those aged 20 years and over) and from the fact that Copenhagen has proportionally more first births occurrinq to women aged under 20 years, the age group in which the rates of premarital conceptions are especially high. 24 1 2011 © Population Association...

... Contraceptive Failure Milbank Memorial Fund Nancy Rate References 1 Sheps M. C. ( 1966 ). On the Person Years Concept in Epidemiology and Demography . Milbank Memorial Fund Quarterly , XLIV ( No. 1 ), 69 – 91 . 10.2307/3349039 2 Potter R. G. ( 1963 ). Additional Measures...

... indices were developed relating induced abortion to total conceptions for whites and nonwhites. The illegal abortion rate per 100 conceptions was estimated to be 14.9 for whites and 32.9 for nonwhites. Estimates of the proportion of women having an abortion during their lifetime among women 18 years old...