PROBABILITY OF CONCEPTION ON DIFFERENT DAYS OF THE MENSTRUAL-CYCLE - AN ONGOING EXERCISE

The design of the European Multicenter Study on the probabilities of c onception in different days of the menstrual cycle is reviewed. Some r esults, based on part of the data, are presented. These can be summari zed as follows: a) Estimates of the probabilities of conception are lo wer than the ones previously reported in the literature; b) A strong e ffect of the man's age on fecundability was found. No evidence of a si milar impact of the woman's age was demonstrated; c) The number of day s with 'most fertile' mucus and parity affect fecundability.