Epidemiological transition ratio is defined as:-

Epidemiological Transition Ratio is defined as the ratio of DALYs caused by CMNNDs (Communicable, maternal, neonatal, and nutritional diseases) to those caused by NCDs and injuries. A ratio >1 indicates a higher burden of CMNNDs than NCDs and injuries, while a ratio <1 indicates the opposite. The lower the ratio, the greater the contribution of NCDs and injuries to a state's overall disease burden.