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| Study | McCann 1990 | Berenson 1992 | Berenson 2002 | Myhre 2003 |
| Age of Subjects | 5-8 | 4-7 | 3-8 | 5-7 |
| Horizontal Diameter of Hymenal Opening (range) | 1.0 - 9.0 mm | 2.0 - 4.8 mm | 1.0 - 10.5 mm | 0.8 - 9.5 mm |
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