“…It has been proposed that a set of tracer coverage indicators can be selected, divided into two groups -promotion and prevention; and treatment and care -and that averages of several tracer indicators should be calculated, using an approach that is similar to the composite coverage index. 22 Monitoring universal health coverage is more complex than monitoring only coverage of reproductive, maternal, newborn and child health care; indicators also need to cover cardiovascular disease, mental health, injuries, cancer and several infectious diseases, as well as financial protection. 23,24 Given that universal health coverage tracer indicators tend to be age-specific, and in some cases sex-specific, it is unlikely that a cumulative index such as co-coverage will be useful as a single summary measure.…”