Table 4 Results of cluster analysis
Variable n (%) |  | Cluster 1 (n = 4123) | Cluster 2 (n = 1877) | P |
|---|---|---|---|---|
Gender | 0 | 1916 (46.471) | 707 (37.666) | < 0.001 |
| Â | 1 | 2207 (53.529) | 1170 (62.334) | Â |
Age | 0 | 2131 (51.686) | 5 (0.266) | < 0.001 |
| Â | 1 | 1475 (35.775) | 337 (17.954) | Â |
| Â | 2 | 517 (12.539) | 1535 (81.779) | Â |
Pulp condition | 0 | 3569 (86.563) | 0 (0.000) | < 0.001 |
| Â | 1 | 531 (12.879) | 163 (8.684) | Â |
| Â | 2 | 23 (0.558) | 323 (17.208) | Â |
| Â | 3 | 0 (0.000) | 1391 (74.108) | Â |
Periodontal condition | 0 | 1236 (29.978) | 31 (1.652) | < 0.001 |
| Â | 1 | 2357 (57.167) | 185 (9.856) | Â |
| Â | 2 | 530 (12.855) | 1661 (88.492) | Â |
Relationship of the tooth root to the floor of the maxillary sinus | 0 | 1850 (44.870) | 1063 (56.633) | < 0.001 |
| Â | 1 | 2273 (55.130) | 814 (43.367) | Â |
Morphology of the floor of the maxillary sinus | 0 | 1637 (39.704) | 934 (49.760) | < 0.001 |
| Â | 1 | 2486 (60.296) | 943 (50.240) | Â |
Vessels of the lateral wall of the maxillary sinus | 0 | 1442 (34.975) | 816 (43.474) | < 0.001 |
| Â | 1 | 2681 (65.025) | 1061 (56.526) | Â |
Mucosal condition of the maxillary sinus | 0 | 2398 (58.162) | 919 (48.961) | < 0.001 |
| Â | 1 | 1725 (41.838) | 958 (51.039) | Â |
Presence of maxillary sinusitis | 0 | 3989 (96.750) | 1834 (97.709) | 0.042 |
| Â | 1 | 134 (3.250) | 43 (2.291) | Â |
Development of the maxillary sinus | 0 | 3900 (94.591) | 1794 (95.578) | 0.107 |
| Â | 1 | 223 (5.409) | 83 (4.422) | Â |
Cortical bone condition of the floor of the maxillary sinus | 0 | 3895 (94.470) | 1754 (93.447) | 0.117 |
| Â | 1 | 228 (5.530) | 123 (6.553) | Â |
Cyst or not | 0 | 3427 (83.119) | 1387 (73.895) | < 0.001 |
| Â | 1 | 696 (16.881) | 490 (26.105) | Â |