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Absolute difference between contact and immersion technique (defined as absolute value of contact minus immersion measurements)
| Absolute difference in millimeters | N (%) |
|---|---|
| ≤0.1 | 10 (20) |
| >1, ≤0.2 | 10 (20) |
| >2, ≤0.3 | 9 (18) |
| >3, ≤0.4 | 4 (8) |
| >0.4 | 17 (34) |
| 50 (100) |
