Recent advances in laboratory techniques for measuring the pregnancy hormone human
chorionic gonadotropin have allowed detection of occult very early pregnancy losses based …

The purpose of this paper is to investigate some characteristics of rates of conception in a
mixed or heterogeneous population. Consider that one has data showing, for a sample of …

Estimates of fecundability, the probability of becoming pregnant during a single menstrual
cycle, have recently been put forward, based on estimates derived from conception delays …

Background. To study the prevalence of infertility, outcome of pregnancy, and uptake of
medical services in a rural population. Methods. 1000 women aged 45–54 years, randomly …

A postal questionnaire was used to assess the prevalence of primary and secondary
infertility in Somerset. Three age groups of women were surveyed: those aged 36–40 (n …

IN the practice of medicine one important function of the doctor is to give a reasonably
reliable prognosis, both immediate and remote. A few years ago we investigated the …

To estimate the prevalence and main causes of infertility, a multicentre survey was
conducted over 1 year (July 1988–June 1989) in three regions of France. All the 1686 …

CONTRACEPTION AND FERTILITY IN 4945 MARRIED WOMEN. A SECOND REPORT ON
A STUDY OF FAMILY LIMITATION'BY RAYMOND PEARL INTRODUCTION N SEPTEMBER …

The difficulties inherent in measuring the prevalence of subfertility are discussed. Four
subtypes of subfertility are defined, enabling comparisons to be made between the widely …

Materials and Methods In this analysis we used three sources of data on infertility: the 1965
National Fertility Study and the 1973 and 1976 National Surveys of Family Growth. Because …