Table 3.
Cholesteatoma of middle ear and mastoid in the end of follow-up stratified by variables listed in the table by using Cox regression.
| Brain Injury | With | Without | Ratio | Adjusted HR | 95%CI | 95%CI | p | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Variables | Event | PYs | Rate (per 105 PYs) |
Event | PYs | Rate (per 105 PYs) |
|||||
| Total | 487 | 671,019.80 | 72.58 | 788 | 2089,637.43 | 37.71 | 1.925 | 2.742 | 2.380 | 3.160 | <0.001 |
| Gender | |||||||||||
| Male | 294 | 367,891.58 | 79.91 | 453 | 1308,410.45 | 34.62 | 2.308 | 2.916 | 2.439 | 3.486 | <0.001 |
| Female | 193 | 303,128.22 | 63.67 | 335 | 781,226.98 | 42.88 | 1.485 | 2.403 | 1.898 | 3.043 | <0.001 |
| Low-income | |||||||||||
| Without | 479 | 653,341.38 | 73.32 | 769 | 2037,529.18 | 37.74 | 1.943 | 2.815 | 2.440 | 3.248 | <0.001 |
| With | 88 | 17,678.44 | 497.78 | 19 | 52,108.25 | 36.46 | 13.652 | 1.764 | 0.279 | 2.092 | 0.601 |
| Catastrophic illness | |||||||||||
| Without | 449 | 580,954.43 | 77.29 | 742 | 1698,403.77 | 43.69 | 1.769 | 2.659 | 2.298 | 3.078 | <0.001 |
| With | 38 | 90,065.37 | 42.19 | 46 | 391,233.66 | 11.76 | 3.588 | 4.448 | 2.511 | 7.881 | <0.001 |
| Cause of injury | |||||||||||
| Traffic injuries | 269 | 330,660.04 | 81.35 | 45 | 111,516.58 | 40.35 | 2.016 | 3.718 | 2.298 | 4.400 | <0.001 |
| Poisoning | 0 | 846.72 | 0.00 | 1 | 3465.09 | 28.86 | 0.000 | 0.000 | - | - | 0.936 |
| Falls | 59 | 114,645.04 | 51.46 | 10 | 50,033.79 | 19.99 | 2.575 | 4.308 | 2.172 | 8.543 | <0.001 |
| Burns and fires | 0 | 71.50 | 0.00 | 1 | 972.75 | 102.80 | 0.000 | 0.000 | - | - | 0.993 |
| Drowning | 0 | 63.78 | 0.00 | 0 | 142.27 | 0.00 | - | - | - | - | - |
| Suffocation | 0 | 43.58 | 0.00 | 1 | 1164.33 | 85.89 | 0.000 | 0.000 | - | - | 0.994 |
| Crushing/Cutting/Piercing | 16 | 19,105.02 | 83.75 | 21 | 25,836.71 | 81.28 | 1.030 | 1.952 | 0.957 | 3.980 | 0.066 |
| Other unintentional injuries | 5 | 8249.28 | 60.61 | 20 | 42,490.77 | 47.07 | 1.288 | 2.119 | 0.776 | 5.791 | 0.143 |
| Suicide | 0 | 479.98 | 0.00 | 3 | 4477.30 | 67.00 | 0.000 | 0.000 | - | - | 0.986 |
| Homicide / Abuse | 21 | 35,091.05 | 59.84 | 3 | 7653.63 | 39.20 | 1.527 | 2.758 | 0.803 | 9.475 | 0.107 |
| Intention unknown | 1 | 944.27 | 105.90 | 0 | 1774.84 | 0.00 | - | - | - | - | - |
| Intentionality of injury | |||||||||||
| Unintentional injury | 318 | 406,063.25 | 78.31 | 89 | 188,840.93 | 47.13 | 1.662 | 2.745 | 2.145 | 3.513 | <0.001 |
| Intentional injury | 20 | 33,727.89 | 59.30 | 4 | 11,337.65 | 35.28 | 1.681 | 2.576 | 0.841 | 7.889 | 0.098 |
| Urbanization level | |||||||||||
| High | 181 | 165,497.50 | 109.37 | 329 | 613,218.28 | 53.65 | 2.038 | 2.839 | 2.272 | 3.549 | <0.001 |
| Middle | 229 | 280,303.89 | 81.70 | 393 | 929,405.03 | 42.29 | 1.932 | 2.447 | 1.991 | 3.009 | <0.001 |
| Low | 77 | 225,218.41 | 34.19 | 69 | 546,951.12 | 12.62 | 2.710 | 3.743 | 2.487 | 5.633 | <0.001 |
| Level of care | |||||||||||
| Hospital center | 239 | 162,375.45 | 147.19 | 472 | 667,553.56 | 70.71 | 2.082 | 2.764 | 2.281 | 3.350 | <0.001 |
| Regional hospital | 213 | 311,469.03 | 68.39 | 280 | 916,963.67 | 30.54 | 2.240 | 2.611 | 2.082 | 3.275 | <0.001 |
| Local hospital | 35 | 197,175.33 | 17.75 | 36 | 505,120.20 | 7.13 | 2.491 | 3.425 | 1.919 | 6.112 | <0.001 |
| Surgery | |||||||||||
| Without | 111 | 402,565.91 | 27.57 | 69 | 1329,927.27 | 5.19 | 5.315 | 5.750 | 3.894 | 8.490 | <0.001 |
| With | 376 | 268,453.89 | 140.06 | 719 | 759,710.16 | 94.64 | 1.480 | 2.388 | 2.047 | 2.789 | <0.001 |
PYs = Person-years; Ratio = Rate in case ÷ Rate in control; Adjusted HR = Adjusted Hazard ratio: Adjusted for all the variables above; CI = confidence interval; CCI = Charlson Comorbidity Index; Unintentional injury: ICD-9-CM E800-E949; Intentional injury: ICD-9-CM E950-E979, E990-E999; Some patients did not provide the information of cause and intentionality of injury.