Story highlights The National Survey of Family Growth has tracked teen sex in the US since 1988

Numbers of teens having sex, using birth control are not much changed in past decade

(CNN) American teens' sex habits and contraceptive use haven't changed much over the past decade, according to a new report from the National Survey of Family Growth, which is administered by the United States Centers for Disease Control and Prevention.

Since 1988, the CDC has been tracking the sexual activities and behaviors of US teens age 15 to 19. The latest numbers from the report released Thursday involved information gathered in interviews with 4,134 teens from 2011 to 2015.

In that time period, 42% of female teens and 44% of male teens reported having had sex at least once, a 1% decrease for females and a 2% increase for males over the previous four years , spanning 2006 to 2010. These differences are not statistically significant.

However, there was a significant decrease in teens who reported having sex in 2011 through 2015 compared to those who reported doing so in 1988. Contraceptive use has also significantly increased over the years. Ninety percent of females now report using contraceptives, compared with 80% in 1988. Males also reported more contraceptive use, from 84% in 1988 to 95% from 2011 to 2015.

Compared with the 2006-2010 report, the latest survey found that reported contraceptive use increased from 86% to 90% in females and 93% to 95% in males, respectively. But these rate differences were also not statistically significant.

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