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Medical Eligibility Criteria for Contraceptive Use , published by the CDC, women and adolescents under the age of 20 and women who have not given birth are classified in category 2 for IUD use, mainly due to "the risk for expulsion from nulliparity and STIs from sexual behavior in younger age groups." According to the CDC, benefits generally outweigh the risks, and IUDs are recommended for young and nulliparous women, although more careful attention may be required

Released in 2013

P-values represent tests of significance of estimated regression coefficients in the multiple linear regression model