Data Retention Regulations in the Lords

[Ian G Batten]

On Mon, March 30, 2009 21:56, Alan Braggins wrote:
> 2009/3/30 Roland Perry <lists@internetpolicyagency.com>:
>
>>>
>>> Twins are generally the same age.
>>> http://en.wikipedia.org/wiki/Twins#Statistics says 1.9% though, not
>>> 1%.
>>>
>>
>> (Although only 0.2% are identical twins)
>>
>
> Good point

The rate of multiple births has risen because of IVF, and those are almost
all non-identical.  I presume that it's still possible for a single
implantation to result in identical twins, but I assume that has the same
rate of `natural' identical twins.  IVF technique has improved, so fewer
fertilised eggs are being implanted; on the other hand, more people in
absolute terms are receiving IVF.

ian