We noted the age and Cobb angle of the first radiograph showing a rotatory subluxation and the age of menopause.We used linear regression and the analysis of variance test.

• 记录出现旋转性半脱位的年龄和其初次摄片的Cobb角，以及记录绝经的年龄，所得数据采用直线回归及变量分析统计。