Comparison of SIR values.

SIR, signal intensity ratio; TIA, transient ischemic attack.aValues are means (SD).bExact p values (2-tailed).cAsymptotic p values based on the normal approximation (2-tailed).SIR：信号强度比（signal intensity ratio）；TIA：短暂性脑缺血发作（transient ischemic attack）。a值以均值（标准差）表示；b值为精确双侧p值；c值为基于正态近似的渐近双侧p值。