When the researchers analysed women who had already given birth or who had no complicating conditions, the cost differences between planned places of birth narrowed.
We obtained figures from both universities for the months of birth of undergraduate applicants for places in 2012.
"While in some areas we are seeing a maturing population and a fall in the demand for school places, in others, with more people moving in and an increase in birth rates, there will be a need for more places, " said Councillor Les Wicks.
And places like Silicon Valley will no doubt give birth to more of these services.
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Increasing the number of primary school places is needed to deal with the increasing birth rate and new housing estates being built in the area.
The rising birth rate is driving a big expansion in primary school places, with many temporary classrooms being added, and this is set to move through to the secondary school population.
The shortage of places in primary schools reflects a growth in the birth rate - with some areas facing an increase of 25% or above in the primary school population.
Ms O'Conner said a rising birth rate and new housing developments had led to the shortage of places.
Last month, figures from the National Audit Office showed the need for more than 250, 000 extra primary school places next year, to meet the demand of a rising birth rate.
Those leafy little New England towns with four-year liberal arts colleges may be fine places in which to paint, write or retire, but it's unlikely they'll birth the next Google or Gilead Sciences.
And a report from the National Audit Office last month said an estimated 250, 000 new places (mainly primary) will be needed by autumn 2014 to meet rising demand caused by the rising birth rate.
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