Published analysis of contraceptive effectiveness of Daysy and DaysyView app is fatally flawed

@LyssAnthrope @EpiEllie May depend on how many words you need to fully clarify your concerns? If not possible to squeeze into one LTE - you can ask if you can submit a longer paper/commentary/viewpoint (I did that here, for example: https://t.co/NUBxjTS2vi

@vheidiv @ZiaFox_ From reading into it, the 99.4% claim came from a study they funded but was not replicated by other findings which found the method to be unreliable. That study has now been retracted. The real effectiveness is likely much lower. https:/

@DavidCHarbord That was after I published a peer-reviewed commentary that led to retraction of that paper (https://t.co/NUBxjTS2vi), & requested FDA investigate (which led to FDA making the company change their marketing language). Even with caution &a

@katy_mcmillan Great - and do let me know if you’d like to chat more. This is the commentary that led to the retraction of the story: https://t.co/NUBxjTS2vi. Retraction was covered in Buzzfeed, here: https://t.co/3pwv2U4Fcz.