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Study design, country of study and population
| N | % | |
| Study design | ||
| Quantitative | 25 | 71.4 |
| Qualitative | 9 | 25.7 |
| Mixed-method | 1 | 3.2 |
| Total | 35 | 100.0 |
| Country | ||
| USA | 20 | 57.1 |
| New Zealand | 7 | 20.0 |
| Canada | 4 | 11.4 |
| Australia | 4 | 11.4 |
| Total | 35 | 100.0 |
| Population studied | ||
| Children (0–18 years) | 18 | 51.4 |
| Adults | 10 | 28.6 |
| All ages | 7 | 20.0 |
| Total | 35 | 100.0 |
