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| Study ID | Screened | Entered (% Screened) |
| CLVR 2005 | 406 | 62 (15) |
| Clarenbach 2015 | 40 | 30 (75) |
| Criner 1999 | 200 | 37 (19) |
| Geddes 2000 | 174 | 48 (28) |
| Goldstein 2003 | 328 | 55 (17) |
| Hillerdal 2005 | 304 | 106 (35) |
| McKenna 1996 | Unclear | 72 (unclear) |
| NETT 2003 | 3777 | 1218 (32) |
| OBEST 2005 | 332 | 35 (11) |
| Pompeo 2012 | Unclear | 63 (unclear) |
| Stammberger 2000 | Unclear | 74 (unclear) |
| Total | 5561 | 1591 (29)* *Excludes data from McKenna 1996, Pompeo 2012 and Stammberger 2000. |
