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Study setting of empirical availability research
| Location | All | Ecological studies | Policy evaluations and natural experiments | Studies directly measuring availability |
|---|---|---|---|---|
| Australia | 20 | 14 | 6 | 17 |
| Canada | 10 | 2 | 8 | 4 |
| Europe | 12 | 6 | 6 | 6 |
| Latin America | 1 | 0 | 1 | 0 |
| New Zealand | 4 | 3 | 1 | 3 |
| USA (California) | 91 (35) | 80 (31) | 11 (4) | 86 (35) |
| Total | 138 | 105 | 33 | 116 |
