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The mean distance from the tip of root canal filling to radiographic apex and the mean total number of radiographs in group I and group II.
| Variable | Group I | Group II | ||||
| Number | Mean | SD | Number | Mean | SD | |
| Mean distance from tip of root canal filling to radiographic apex (mm) | 67 | -0.5 | 0.5 | 84 | -0.4 | 0.5 |
| Number of Radiographs (mean) | 67 | 2.0 | 0.1 | 84 | 3.2 | 0.5 |
SD = standard deviation
