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. 2020 Sep 11;17(18):6624. doi: 10.3390/ijerph17186624

Table 4.

Factors of acquired stenosis of external ear canal and cholesteatoma of middle ear and mastoid in the end of follow-up by using Cox regression.

Brain Injury With Without Ratio Adjusted HR 95%CI 95%CI p
Subgroup of Events 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
Acquired stenosis of external ear canal 166 671,019.80 24.74 189 2089,637.43 9.04 2.735 3.549 2.713 4.644 <0.001
Cholesteatoma of middle ear and mastoid 304 671,019.80 45.30 579 2089,637.43 27.71 1.635 1.777 1.494 2.114 <0.001
Both 17 671,019.80 2.53 20 2089,637.43 0.96 2.647 4.099 1.001 21.781 0.049

PYs = Person-years; Ratio = Rate in case ÷ Rate in control; Adjusted HR = Adjusted Hazard ratio: Adjusted for variables listed in Cox sheet; CI = confidence interval.