Weight Change Among Users of Three Progestin-Only Methods of Contraception Over a 12-Month Time Period

Weight Change Among Users of Three Progestin-Only Methods of Contraception Over a 12-Month Time Period

The purpose of this study is to learn whether women who use progestin-only methods of birth control such as the contraceptive implant (Implanon), the levonorgestral-releasing IUS (Mirena), or depot medroxyprogesterone acetate(DMPA) will experience weight change compared to women using the non-hormonal copper IUC (ParaGard).

The investigators primary hypothesis is that users of DMPA will gain excess weight and increase their BMI above the copper-IUC users; secondarily, the investigators will compare users' data in the LNG-IUC and ENG implant groups to the copper-IUC group.

Inclusion Criteria:

• Patients enrolled in CHOICE between the ages of 18 and 45 who consented to future studies
• Chose levonorgestrel-releasing IUD, copper IUD, the implant, or DMPA as their CHOICE baseline method
• Has baseline height and weight data collected from the on-campus enrollment site
• Able to come back to the on-campus enrollment site for consent process and enrollment activities

Exclusion Criteria:

• Recent history of DMPA use before starting their baseline CHOICE method
• Used current method for less than 11 months or more than 12 months and three weeks