Table 4 Distribution of studies by outcome area and comparators used
Comparator | Total | Environmental studies | Socio economic studies | Health studies | ||||
|---|---|---|---|---|---|---|---|---|
No. | % | No. | % | No. | % | No. | % | |
BACI (before–after and control–impact) | 4 | 3 | 3 | 3 | 4 | 7 | 0 | 0 |
Before–after | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 |
Control–impact | 34 | 22 | 26 | 28 | 3 | 5 | 7 | 26 |
Counterfactual | 7 | 5 | 2 | 2 | 4 | 7 | 3 | 11 |
Multiple cases | 25 | 16 | 10 | 11 | 16 | 27 | 1 | 4 |
Single case | 61 | 40 | 38 | 41 | 30 | 50 | 13 | 48 |
Time series | 18 | 12 | 14 | 15 | 3 | 5 | 3 | 11 |
Total | 152 | Â | 93 | Â | 60 | Â | 27 | Â |