Table 1.
Comparison among group 1, group 2, group 2-only patients without previous operation (group 2 without op), and group 2-only patients with previous operation (group 2 with op).
| Group 1 (n = 20) | Group 2 (n = 35) | Group 2 without op (n = 20) | Group 2 with op (n = 15) | Significance | ||||
|---|---|---|---|---|---|---|---|---|
| Group 1 versus group 2 | Group 1 versus group 2 without op | Group 1 versus group 2 with op | Group 2 without op versus group 2 with op | |||||
| Clinical features | ||||||||
| Age (mean ± SD), years | 64.3 ± 9.9 | 66.8 ± 15.0 | 71.8 ± 12.7 | 60.1 ± 15.7 | 0.454 | 0.044 | 0.351 | 0.021 |
| Gender (M/F) | 13/7 | 21/14 | 15/5 | 6/9 | 0.779 | 0.731 | 0.182 | 0.080 |
| Diabetes | 19 (95.0%) | 16 (45.7%) | 12 (60.0%) | 4 (26.7%) | <0.001 | 0.020 | <0.001 | 0.087 |
| Previous surgery | 0 (0%) | 15 (42.9%) | 0 (0%) | 15 (100%) | <0.001 | — | — | — |
| Otalgia (pain) | 19 (95.0%) | 22 (62.9%) | 19 (95.0%) | 3 (20%) | 0.010 | 1.000 | <0.001 | <0.001 |
| Otorrhea (exudate) | 18 (90%) | 30 (85.7%) | 16 (80.0%) | 14 (93.3%) | 1.000 | 0.661 | 1.000 | 0.365 |
| Otitis externa (swelling) | 20 (100%) | 16 (45.7%) | 14 (70.0%) | 2 (13.3%) | <0.001 | 0.020 | <0.001 | 0.069 |
| Granulation over EAC | 16 (80%) | 11 (31.4%) | 9 (45.0%) | 2 (13.3%) | 0.001 | 0.048 | <0.001 | 0.002 |
| CN involvement | 4 (20%) | 5 (14.3%) | 5 (25.0%) | 1 (6.7%) | 0.709 | 1.000 | 0.680 | 0.672 |
| Microbiology | ||||||||
| P. aeruginosa | 11 (55%) | 9 (25.7%) | 9 (45.0%) | 0 (0%) | 0.043 | 0.752 | 0.001 | 0.004 |
| MRSA | 5 (25%) | 14 (40.0%) | 7 (35.0%) | 7 (46.7%) | 0.378 | 0.731 | 0.282 | 0.511 |
| Negative culture | 2 (10%) | 3 (8.6%) | 1 (5.0%) | 2 (13.3%) | 1.000 | 1.000 | 1.000 | 0.565 |
Bold type denotes statistically significant difference (P < 0.05).