Watanabe Akihisa, Ono Qana, Nishigami Tomohiko, Hirooka Takahiko, Machida Hirohisa
Department of Rehabilitation, Machida Orthopaedics, Kochi 781-2123,
Acta Med Okayama. 2018 Feb;72(1):67-72. doi: 10.18926/AMO/55665.
It has been unclear whether the risk factors for rotator cuff tears are the same at all ages or differ between young and older populations. In this study, we examined the risk factors for rotator cuff tears using classification and regression tree analysis as methods of nonlinear regression analysis. There were 65 patients in the rotator cuff tears group and 45 patients in the intact rotator cuff group. Classification and regression tree analysis was performed to predict rotator cuff tears. The target factor was rotator cuff tears; explanatory variables were age, sex, trauma, and critical shoulder angle≥35°. In the results of classification and regression tree analysis, the tree was divided at age 64. For patients aged≥64, the tree was divided at trauma. For patients aged<64, the tree was divided at critical shoulder angle≥35°. The odds ratio for critical shoulder angle≥35° was significant for all ages (5.89), and for patients aged<64 (10.3) while trauma was only a significant factor for patients aged≥64 (5.13). Age, trauma, and critical shoulder angle≥35° were related to rotator cuff tears in this study. However, these risk factors showed different trends according to age group, not a linear relationship.
目前尚不清楚肩袖撕裂的危险因素在所有年龄段是否相同，还是在年轻人群和老年人群之间存在差异。在本研究中，我们使用分类与回归树分析作为非线性回归分析方法，研究了肩袖撕裂的危险因素。肩袖撕裂组有65例患者，肩袖完整组有45例患者。进行分类与回归树分析以预测肩袖撕裂。目标因素为肩袖撕裂；解释变量为年龄、性别、创伤和临界肩角≥35°。在分类与回归树分析结果中，树在64岁时进行划分。对于年龄≥64岁的患者，树在创伤处进行划分。对于年龄<64岁的患者，树在临界肩角≥35°处进行划分。临界肩角≥35°的优势比在所有年龄段（5.89）以及年龄<64岁的患者中（10.3）均具有统计学意义，而创伤仅在年龄≥64岁的患者中是一个显著因素（5.13）。在本研究中，年龄、创伤和临界肩角≥35°与肩袖撕裂有关。然而，这些危险因素根据年龄组呈现出不同的趋势，并非线性关系。
