Menstrual cycle shortest and longest cycle lengths is considered very irregular. The average menstrual cycle lasts 28 days. The variability of menstrual cycle lengths is highest for women under 25 years of age and is lowest, that is, most regular, for ages 25 to 39. Subsequently, the variability increases slightly for women aged 40 to 44. The luteal phase of the menstrual cycle is about the same length in most individuals (mean 14.13 days, standard deviation 1.41 days) whereas the follicular phase tends to show much more variability (log-normally distributed with 95% of individuals having follicular phases between 10.3 and 16.3 days).
Half the Sky and when seen by patriarchal husbands and affected wives can change household dynamics. Another solution is sponsored by Always, Always provides feminine care products to school girls so that they do not miss school during their menstrual cycle, which often happens because they feel ashamed. The final and probably most empowering solution is an education. Allowing girls to attend school and go beyond elementary school can truly help women advance in developing countries. Carolyn See, a book critic from "The Washington Post", said in her review: "'Half the Sky' is a call to arms, a call for help, a call