Earlier this year Mayor Michael Bloomberg celebrated the citywide decline of the teen pregnancy rate over his time in office.* New York City’s teen pregnancy rate has fallen by a third between 2002 and 2011, according to the city’s Department of Health and Mental Hygiene.

We wanted to see the finer details of this claim of success by comparing rates by borough. Has each borough’s rate dropped? Or has the citywide rate been skewed by the success of one or two boroughs?

It turns out each borough is a success story when it comes to declining rates of teen pregnancy. The degree of change, however, varies.

The most recent statewide data indicates that Staten Island has the lowest rate at 41.2 pregnancies per 1,000 female teenagers. The Bronx has the highest rate at 97.4 pregnancies per 1,000 female teenagers, more than twice Staten Island’s rate.

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From 2002 to 2011 each borough had a decline in the teen pregnancy rate, though it has not been a smooth drop in any, based on data compiled by the state’s Department of Health. Staten Island begins with the lowest rate and ends with the lowest rate, while the Bronx remains the highest throughout the 10 years studied here.

When you compare the rate of change in each of the boroughs, Staten Island has seen the biggest drop in teen pregnancy from 2002 to 2011 by 32 percent, while Queens had the smallest decrease for the same period, at 27 percent.

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* The teen pregnancy rate is the sum of all live births, abortions and miscarriages per 1,000 females aged 15 to 19, as defined by the Department of Health and Human Services.