42% of the research was actually low quality, so what we do have, the majority of it was kind of low quality in terms of they weren't really looking at the menstrual cycle hormones in terms of blood sampling and the gold standard methods, so not only do we have a research gap we have this quality issue as well. so, moving forward, not only do we need to increase the quantity of research we're getting, but we also need to make it better, so we can get to those sort of more accurate conclusions on female physiology. there are a lot of more popular apps available, including fitrwoman, flo and clu...