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The mean total number of radiographs in group I and group II in different subgroups.
| Variable | Group I | Group II | |||||
| Number | Mean | SD | Number | Mean | SD | ||
| Tooth Position | Premolar teeth | 17 | 2.0 | 0 | 19 | 3.1 | 0.3 |
| Molar teeth | 50 | 2.0 | 0.1 | 57 | 3.2 | 0.5 | |
| Upper teeth | 36 | 2.0 | 0 | 55 | 3.2 | 0.5 | |
| Lower teeth | 32 | 2.0 | 0.1 | 29 | 3.1 | 0.4 | |
| Tooth Status | Vital | 19 | 2.0 | 0.2 | 24 | 3.4 | 0.7 |
| Non- vital | 48 | 2.0 | 0 | 50 | 3.1 | 0.3 | |
