Ezenyeaku, C.C., Ezebialu, I.U., Umeobika, J.C., Akabike, J., Ezenyeaku, C.A., Ojiyi, C.E. and Okeke, T.C. 2021. Assessment of age at menarche and menstrual pattern among secondary school girls in Awka, Southeast Nigeria. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 10, 6 (May 2021), 2192–2197. DOI:https://doi.org/10.18203/2320-1770.ijrcog20212146.