Intervention Impact Score Calculation

Intervention impact is calculated based on population reach and intervention effect size that are rated separately and combined into a single score based on the following:

Reach Score Effect Size Score Combined Intervention Impact Score

1 = Low Reach – The study or studies excluded or probably excluded a high proportion of members of the defined target population (i.e., defined according to demographic and/or risk factor characteristics). The intervention tested was not representative of the target population.

1 – Small

1

3 – Medium

2

5 – Large

3

3 = Moderate Reach – The study or studies excluded or probably excluded a small but significant proportion of members of the defined target population. The intervention tested may be only partially representative of the target population.

1 – Small

2

3 – Medium

3

5 – Large

4

5 = Broad Reach – The study or studies included virtually all relevant members of the defined target population. The intervention tested was representative of the target population.

1 – Small

3

3 – Medium

4

5 – Large

5
Updated:4/12/2010