Collecting comprehensive data around adolescent health can be challenging. PMA2020 has recently published three adolescent & young adult health briefs from Kenya, Ghana, and Ethiopia. These briefs are snapshots of key indicators among young women, ages 15-24.
You can find data on use of emergency contraception in all three of these briefs, on the second page. In all three countries, there is a very high use of EC for unmarried under the age of 25, as compared to married women under the age of 25.
Other key indicators in the briefs include: level of education, median age at key reproductive events such as first sex and first contraceptive use, and modern contraceptive prevalence rate (mCPR).