For example :In this paper

Dhillon PK, Mathur P, Nandakumar A, Fitzmaurice C, Kumar GA, Mehrotra R, Shukla DK, Rath GK, Gupta PC, Swaminathan R, Thakur JS. The burden of cancers and their variations across the states of India: the Global Burden of Disease Study 1990–2016. The Lancet Oncology. 2018 Oct 1;19(10):1289-306.

The M/I ratio is as a tool to describe various health related factors.