Well first of all, it would help if you gave us a reference to these headlines as it is difficult to comment without seeing the source of the information first hand.
Secondly, how is mixed race defined - there are lots of combination that can be considered mixed, e.g. white Irish/Spanish.
Thirdly, my first thought, rather flippantly I suppose, was that maybe black girls are less incline to have an abortion compared to the other groups (I'm assuming the comparison is with mainly Caucasian and Asian girls).
I have attached a link to the DoH for the latest statistics on abortion in the UK, here . In 2004, there was over 185000 abortions. Now considering that 92% of the population is white, 2.2% is black and 1.4% is mixed, 4.4% South Asian and 0.4% Chinese (stats are here ), if the population is 60million, then approx 1.3 million are black, approx half will be women and only a percentage of that will be teenagers. Therefore, from my rough deduction, the figures suggest that most abortions must be from the white population.
Therefore, my question is, what point was the original article trying to make and did it consider all the facts such as abortion rates etc?