Table 4 -. Analysis of variables related to severe external root resorption (EARR).
| Variable | Severe root resorption | Total (%) | χ2 | P-value | ||
|---|---|---|---|---|---|---|
| Absent n (%) | Present n (%) | |||||
| Sex | Male | 389 (98.0) | 8 (2.0) | 397 (100) | 1.95 | 0.162 |
| Female | 542 (96.4) | 20 (3.5) | 562(100) | |||
| Dental arch | Upper | 451 (94.5) | 26(5.4) | 477 (100) | 22.3 | 0.000 |
| Lower | 480 (99.6) | 2 (0.4) | 482 (100) | |||
| Extraction | Yes | 389 (94.1) | 24 (5.8) | 413 (100) | 21.3 | 0.000 |
| No | 542 (99.2) | 4 (0.7) | 546 (100) | |||
| Treatment duration |
< 3 years | 174 (100) | 0 (0) | 174 (100) | 6.4 | 0.011 |
| > 3 years | 757 (96.4) | 28 (3.6) | 785 (100) | |||
| Apex | Open | 264 (100) | 0 (0) | 264 (100) | 10.9 | 0.000 |
| Closed | 667 (96.6) | 28 (4.0) | 695 (100) | |||
| Root shape* | Romboidal | 325 (96.7) | 11 (3.3) | 336 (100) | 0.97 | 0.324 |
| Triangular | 342 (95.2) | 17 (4.7) | 359 (100) | |||
| Overjet | < 5 mm | 516 (98.7) | 7 (1.3) | 523 (100) | 10.4 | 0.001 |
| ≥ 5 mm | 415 (95.2) | 21 (4.8) | 436 (100) | |||
| Overbite | < 5 mm | 693 (96.9) | 22 (3.1) | 715 (100) | 0.24 | 0.624 |
| ≥ 5 mm | 238 (97.5) | 6 (2.5) | 244 (100) | |||
*
The sum of root shapes T and R (695) corresponding to the number of teeth with closed apex.