Central artery AIx was increased in the middle-aged individuals with normal blood pressure than in the young individuals, but the difference was no significant after adjustment for age.

• 血压正常者PWA结果显示 ；中年组与青年组比较增强指数有极显著性差异 (P <0 .；0 1)；经年龄调整后两组间无显著性差异。