The Maternal Mortality Ratio (MMR) is defined as:

\\text{MMR} = \\frac{\\text{Number of maternal deaths}}{\\text{Number of live births}} \\times 100{,}000

It is expressed per 100,000 live births. This is distinct from the Maternal Mortality Rate, which uses the total female population of reproductive age as the denominator. Pakistan's MMR remains high compared to global targets, making this a key indicator for community health nursing assessment.