Summary of Health Knowledge and Behavior Findings.

1Out of a possible rating of 9, where score of 9 is the least biased. WHO-JHU Synthesizing Intervention Effectiveness Project 9-point rigour scale.*In the authors' view the use of national survey data to evaluate programs, as applied in these two studies, is inappropriate and highly susceptible to confounding from a number of sources. For these reasons, despite scores of 4 on the rigour scale, we believe the results from these studies should be assessed with caution.