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Characteristics of population in 18 included studies (21 experiments).
| Variable (No. of Experiments Available for Calculations) | No. (%) Mean (Range) |
|---|---|
| Participating people (21) | 916 43.62 (3–250) |
| Eligible people (20) | 812 40.60 (3–250) |
| Age (18) | 23.8 (17–47) |
| Percentage of females (16) | 45.13 (0–86) |
| Ethnicity (4) | |
| Chinese | 2 (9.52) |
| European | 2 (9.52) |
