Denominator of maternal moality ratio is -
maternal moality ratio = Total number of female deaths due to complications of pregnancy, child bih or within 42 days of delivery from puerpural causes in an area during a given year Divided by Total number of live bihs in the same area and year X 1000 or 100000 Reference Park&;s textbook of preventive and social medicine 23rd edition pg 557
1000 total bihs
Mid year population
1000 live bihs
Total live bihs
obstetrics,pediatrics and geriatrics