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Characteristics of the sample
| Town (n) | |
| Giessen: 90 | |
| Marburg: 84 | |
| Sex (n) | |
| male: 91 | |
| female: 83 | |
| educational status of parents (n): | |
| UED: 123 | |
| no UED: 44 | |
| unknown: 7 | |
| brushing hand (n) | |
| right: 148 | |
| left: 12 | |
| both: 14 | |
| Dental status (mean ± SD) | |
| permanent teeth: 22.7 ± 4.7 | |
| DMFT: .57 ± 1.2 |
UED: at least one parent with university entrance diploma
