Evaluators may want to disaggregate by the following age ranges: 10-14, 15-19, and 20-24.

Evaluators can readily compile data on the number and characteristics of adolescents that attend program ac­tivities or seek clinical services at fixed sites. To mea­sure the reach of mass media and similar programs, evaluators can survey the intended audience and thus obtain counts or estimates of the percentage of adoles­cents “exposed“ to specific communication programs.

In addition to the number and percent of adolescents in the intended population served or reached by the pro­gram, the evaluator should ascertain if the program reaches key sub-groups of adolescents. For example, health facility-based programs that reach primarily older, married females who have previously been pregnant will likely have a very different population impact than will comparable programs that reach younger, unmarried adolescents of both genders. Similarly, —low-risk“ youth recruited as peer promoters who contact and engage other low-risk youth will likely have a very different population impact than will higher-risk youth recruited to contact other higher-risk youth.  In short, the evalua­tor needs to verify that the program is reaching the sub­groups of interest within the population at large.