Research question What is the fecundity rate among fertile couples, and which factors
influence it? Design Retrospective study of all puerperae attending Cruces University …

Study question Sex, smoking, age and natural fecundity: results of a survey performed on
2510 puerperal women and their partners. Summary answer We reported that the best …

We review available data on fecundity of couples in France, and give an overview of some
current results in other countries. Beside studies concerning perceived fecundity troubles …

BACKGROUND The validity of studies on fecundability in Western countries has been
questioned. The complexity of societal and cultural factors makes it difficult to dissect pure …

World population first exceeded a billion people in the early 1800s and it took approximately
a century for the next billion increase. In 1999, our population exceeds six billion. Another …

There has been an increasing tendency to delay parenthood in developed countries in
recent years, and there is not enough information available regarding the effect of this on …

STUDY QUESTION Does sexual intercourse enhance the cycle fecundability in women
without known subfertility? SUMMARY ANSWER Sexual intercourse (regardless of timing …

STUDY QUESTION Do couple's age ranges for optimal fecundability, and the associations
with fecundability of couple's age combinations and age differences differ with gravidity …

Objective: To analyze different factors influencing positive pregnancy rate (PPR) and live
birth rates (LBR) following in vitro fertilization (IVF). Materials and Methods: Between …

Study question To what extent is the frequency of sexual intercourse associated with
fecundability? Summary answer Frequency of sexual intercourse was the most influential …