Menstrual Hygiene Day Menstrual Hygiene Day Menstrual Hygiene Day (MHD, MH Day in short) is an annual awareness day on May 28 to highlight the importance of good menstrual hygiene management (MHM). It was initiated by the German-based NGO WASH United in 2014 and aims to benefit women and girls worldwide. The 28th was selected to acknowledge that 28 days is the average length of the menstrual cycle. In low-income countries, girls’ choices of menstrual hygiene materials are often limited by the costs, availability and social norms. Adequate sanitation facilities and access to feminine hygiene products are one part of the solution. Creating
Menstrual synchrony and Schank followed up on this point by using computer simulations to estimate the average onset difference that would occur by among women with variable cycle lengths and a mean cycle length of 29.5 days reported by McClintock. They reported that the average onset difference by chance among women with cycle characteristics reported by McClintock was about 5 days. They also calculated the expected onset difference at the beginning of the study using McClintock's method for calculating initial cycle onset differences. They reported that the initial cycle onset difference for the groups of women using McClintock's method was about 6.5