...准差(SDNN)、相邻R-R间期差值的平方根(rMSSD)、相邻R-R间期差值的标准差(SDSD)、全程记录每5分钟R-R间期 标准差的平均值 ( SDANN )。频阈指标低频/高频(LF/HF)：HRV频阈分析将功率谱分成高频和低频，HF功率频段0.15～0.4Hz，LF功率频段0.04～0.15Hz[1]。
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这两个测量读数之差的平均值就是我们所希望的电压差。
The average of the difference between these two readings is the desired voltage difference.
它也是有记录以来任何一个月中最大的负异常，指的是低于长期平均值的差分。
It was also the largest negative anomaly, meaning difference below the long-term average, on record for any month.
对于连续性变量结局，你需要输入每组的参与者数目、结局的平均值和标准差。
For continuous outcomes, you will need to enter the number of participants, the mean outcome value and the standard deviation for each group.
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