1. Male fertility rates
The estimates in these charts are created by using data on the number of previous children women have had. This data is collected when new births are registered. At present this information is not collected for men so it is not possible to produce an estimate for the percentage of men who have not fathered a child. Furthermore, approximately 6% of births are registered without information on the father being provided which also affects our ability to generate comparable statistics for men. However data on male fertility rates is published annually on the same day as this release.

2. The end of childbearing years
The chart showing "Average number of children for women at the end of their childbearing years" will only show for women born between 1920 and 1970. Some of the women born in years towards the end of this time period may go on to have more children, however we make the assumption that they are at the end of their childbearing years and present data about them here. This is because less than 0.2% of births occur after the age of 45 and this assumption is also in line with international standards. More information on these statistics and the assumptions made is available.