8 a New users no use of combination hormonal contraception for at least the prior 6 months b Includes low dose COCs containing the following progestins norgestimate, norethindrone, levonorgestrel, desogestrel, norgestrel, medroxyprogesterone, or ethynodiol diacetate c Includes low dose COCs containing the following progestins levonorgestrel, desogestrel, dienogest, chlormadinone acetate, gestodene, cyproterone acetate, norgestimate, or norethindrone d Includes low dose COCs containing the following progestins norgestimate, norethindrone, or levonorgestrel doxycycline hyc 100 mg