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Table 1 Patients of study divided by sex, age range, type of treatment, and mechanism of injury according to AO-OTA [14] and Neer [15] classifications. (y, years old; N, number of cases; % group, percentage cases within this AO-OTA group or NEER group classification; % age, percentage cases within this range of age)

From: Epidemiology of proximal humerus fractures

  AO_OTA classification All Neer classification All
A B C Non displaced 2-part 3-part 4-part Fracture-dislocation
Female < 50y N 26 4 1 31 17 11 2 1 0 31
% age 83.9% 12.9% 3.2% 100% 54.8% 35.5% 6.5% 3.2% 0.0% 100%
% group 11.1% 1.8% 2.6% 6.3% 14.8% 6.9% 1.2% 3.0% 0.0% 6.3%
> 50y N 208 219 37 464 98 149 159 32 26 464
% age 44.8% 47.2% 8.0% 100% 21.1% 32.1% 34.3% 6.9% 5.6% 100%
% group 88.9% 98.2% 97.4% 93.7% 85.2% 93.1% 98.8% 97.0% 100.0% 93.7%
Male < 50y N 21 7 1 29 13 8 5 1 2 29
% age 72.4% 24.1% 3.4% 100% 44.8% 27.6% 17.2% 3.4% 6.9% 100%
% group 26.3% 13.5% 9.1% 20.3% 32.5% 17.4% 13.9% 9.1% 20.0% 20.3%
> 50y N 59 45 10 114 27 38 31 10 8 114
% age 51.8% 39.5% 8.8% 100% 23.7% 33.3% 27.2% 8.8% 7.0% 100%
% group 73.8% 86.5% 90.9% 79.7% 67.5% 82.6% 86.1% 90.9% 80.0% 79.7%
Treatment Conservative < 50y N 35 7 0 42 30 8 3 0 1 42
% age 83.3% 16.7% 0.0% 100% 71.4% 19.0% 7.1% 0.0% 2.4% 100%
% group 13.0% 3.0% 0.0% 8.2% 19.9% 4.9% 1.9% 0.0% 3.3% 8.2%
> 50y N 235 224 12 471 121 155 153 13 29 471
% age 49.9% 47.6% 2.5% 100% 25.7% 32.9% 32.5% 2.8% 6.2% 100%
% group 87.0% 97.0% 100% 91.8% 80.1% 95.1% 98.1% 100.0% 96.7% 91.8%
Surgery < 50y N 12 4 2 18 0 11 4 2 1 18
% age 66.7% 22.2% 11.1% 100% 0% 61.1% 22.2% 11.1% 5.6% 100%
% group 27.3% 9.1% 5.4% 14.4% 0% 25.6% 9.8% 6.5% 16.7% 14.4%
> 50y N 32 40 35 107 4 32 37 29 5 107
% age 29.9% 37.4% 32.7% 100% 3.7% 29.9% 34.6% 27.1% 4.7% 100%
% group 72.7% 90.9% 94.6% 85.6% 100% 74.4% 90.2% 93.5% 83.3% 85.6%
Mechanics High energy N 15 6 2 23 5 9 5 2 2 23
% Hihg E 65.2% 26.1% 8.7% 100% 21.7% 39.1% 21.7% 8.7% 8.7% 100%
% group 4.8% 2.2% 4.1% 3.6% 3.2% 4.4% 2.5% 4.5% 5.6% 3.6%
Low energy N 299 269 47 615 150 197 192 42 34 615
% Low E 48.6% 43.7% 7.6% 100% 24.4% 32.0% 31.2% 6.8% 5.5% 100%
% group 95.2% 97.8% 95.9% 96.4% 96.8% 95.6% 97.5% 95.5% 94.4% 96.4%