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| Study | One or two daily doses (n/N) | Three daily doses (n/N) | Risk ratio | 95% CI |
| Principi 1986 | 4/49 | 1/51 | 4.16 | 0.48 to 35.95 |
| Hoberman 1997 | 51/287 | 54/288 | 0.97 | 0.78 to 1.2 |
| Damrikarnlert 2000 | 7/80 | 12/174 | 1.19 | 0.64 to 2.2 |
CI: confidence interval
