| Study |
Assessment of bias |
| Bais 1995 | IIIC |
| Bartels 1995 | IIIC |
| Beattie 1989 | IIIC |
| Castaldo 1981 | IIIC |
| Ellis 1991 | IIIC |
| Hoffman 1994 | IIIC |
| Jong 1995 | IIIC |
| Katz 1981 | IIIC |
| Krebs 1983 | IIIC |
| Larson 1989 | IIIC |
| Lau 1993 | IIIC |
| Lo 1991 | IIIC |
| Lund 1989 | IIIC |
| Nakane 1996 | IIIC |
| Pecorelli 1994 | IIIC |
| Philip 1997 | IIC |
| Redman 1988 | IIIC |
| Rubin 1989 | IIIC |
| Solomon 1983 | IIIC |
| Soo 1988 | IIIC |
| Spears 1988 | IIIC |
| Sun 1995 | IIIC |
| Turnbull 1989 | IIIC |
| Verrees 1996 | IIIC |
| Zoetmulder 1994 | IIIC |
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