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Abstract
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<h5 class="section-title" id="d8681843e130">Purpose:</h5>
<p id="P1">To investigate the influence of sexual activity and contraceptive use on
the decline
in adolescent birth rates and
pregnancy rates since 2007.
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<h5 class="section-title" id="d8681843e135">Methods:</h5>
<p id="P2">We estimated trends in pregnancy risk from 2007 to 2014 using national
data on behaviors
of women aged
15–19.
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<h5 class="section-title" id="d8681843e140">Results:</h5>
<p id="P3">In 2007–2014, increases occurred in use of one or more contraceptive methods
at last
sex (78%–88%), dual
method use (24%–33%), long-acting reversible contraception including intrauterine
device and implant (1%–7%),
withdrawal (15%–26%), and withdrawal in combination with other methods (7%–17%). Pill
use rose and then fell
over time. Level of sexual activity did not change over time. The decline in pregnancy
risk among women aged 15–19 was
entirely attributable to improvements in contraceptive use.
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<h5 class="section-title" id="d8681843e145">Conclusions:</h5>
<p id="P4">Improvements in contraceptive use—including increases in use of long-acting
reversible
contraception and
withdrawal in combination with another method—appear to be driving recent declines
in adolescent birth and pregnancy
rates.
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