Table 1.
Study design | Number of Studies Included | Number of studies that found a positive health impact | Number of studies that found no, or negative, health impacts |
---|---|---|---|
Modeling | 17 | 16 | 3 |
Experimental | 0 | 0 | 0 |
Evaluation | 8 | 4 | 4 |
Mixed methoda | 1 | 1 | 1 |
Total | 26 | 21 | 9 |
aBoth modeling and evaluation