<prompt> Denominator in MMR-1000 live birth1000 women of reproductive ageMid year populationMid year women population  <response>: Ans. is a i.e., 1000 live birthMaternal mortality ratio MMR Maternal mortality ratio is defined as total number of maternal deaths i.e. deaths due to complications of child birth, pregnancy or within 42 days of delivery from puerperal causes in the area during a given year Per 1000 or 100,000 live births in the same area during the same year.MMR Total no. of female death due to complications of pregnancy, childbirth or with 42 days of delivery from puerperal causes in an area during a given year---Total no. of live birth in the same area yearx 1000 or 100,000 Maternal death occuring after 42 days 7 weeks of birth is not included in maternal mortality ratio. It is called late maternal death - Death of women from direct or indirect obstetric causes more than 42 days but less than 1 year after termination of pregnancy.Maternal mortality rate It is the number of maternal death in a given period per 1000 or 100,000 women of reproductive age during same period.Maternal mortality rate Total no. of female death due to complication of pregnancy, childbirth or within 42 days of delivery---Total no. of women of reproductive agex 1000 or 100,000Therefore Denominator in maternal mortality ratio - 1000 live birth or 100,000 live birth Denominator in maternal mortality rate 1000 or 100,000 women of reproductive age. 