Figure-1 (Norethindroneethinyl Fig1)
This appears to be a list of studies comparing the effects of using combined oral contraceptives (COC) to not using them (never-use) on various health outcomes. The studies listed include the NICHD Women's Care Study, French E3N cohort Study, Shanghai Women's Health Study, The Nurses' Health Study, Oxford Family Planning Study, and Danish Sex Hormone Register Study. The table at the bottom shows effect estimates for the different studies, but without more context, it is difficult to interpret the numbers.*