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| Study ID | Control denominator | Number of events | Control event rate or Control Group Risk (CGR) | Range of assumed risk of disease in the population |
| Lucero 2009 | 6094 | 3 | 0.0% |
Low control risk 0.0% to 0.3% Medium control risk 0.4% to 0.7% High control risk> 0.8% |
| Klugman 2003 | 18,626 | 19 | 0.1% | |
| Black 2000 | 18,941 | 55 | 0.3% | |
| Kilpi 2003 | 415.5 | 1.5 | 0.4% | |
| Eskola 2001 | 415.5 | 1.5 | 0.4% | |
| O'Brien 2003 | 2818 | 18 | 0.6% | |
| Cutts 2005 | 8719 | 66 | 0.8% |
