The approach used in cross-cultural studies of depression, schizophrenia, and adhd can be characterized as ;
1. it assumes universally accepted definitions of abnormality and methodology.
2. etic
3. emic abnormal
4. culture-bound

The approach can be characterized as 2. Etic.

Explanation:

An Etic approach in Psychology is used in order to compare certain phenomenons between cultures so universal behaviors can be deduced.

In this case, it can be deduced that an Etic approach is being used because the studies of these disorders are cross-cultural, meaning they focus on finding similar phenomenons regarding these disorders accross various cultures.