减少每日测量次数会导致对健康个体呼气峰值流量昼夜变化的估计不佳。
Reducing the number of daily measurements results in poor estimation of diurnal variability of peak expiratory flow in healthy individuals.
作者信息
Gupta D, Aggarwal A N, Chaganti S, Jindal S K
机构信息
Department of Pulmonary Medicine, Postgraduate Institute of Medical Education and Research, Chandigarh- 160 012, India.
出版信息
J Postgrad Med. 2000 Oct-Dec;46(4):262-4.
AIM
To determine the effect of reducing number of daily measurements on estimation of diurnal variability (DV) of peak expiratory flow (PEF).
SUBJECTS AND METHODS
PEF was recorded five times daily for three days in 152 healthy adults. Amplitude percent mean (A%M) and standard deviation percent mean (SD%M) were calculated on third day from five, four, three and two daily readings. Proportion of variability explained by partial schedules was calculated and limits of agreement derived to assess if these methods could be used interchangeably.
RESULTS
Four, three and two measurements explained 90-95%, 70-82% and 55% DV respectively using A%M. All schedules of partial measurement using SD%M explained >90% DV. Limits of agreement for A%M and SD%M widened as number of measurements were reduced.
CONCLUSIONS
DV obtained by fewer daily measurements agrees poorly with results obtained from five measurements. SD%M is a better alternative if DV is assessed from fewer readings.
目的
确定减少每日测量次数对呼气峰值流速（PEF）昼夜变异性（DV）估计的影响。
对象与方法
152名健康成年人连续三天每天记录5次PEF。在第三天，根据每日5次、4次、3次和2次读数计算平均振幅百分比（A%M）和平均标准差百分比（SD%M）。计算部分测量方案所解释的变异性比例，并得出一致性界限，以评估这些方法是否可互换使用。
结果
使用A%M时，4次、3次和2次测量分别解释了90 - 95%、70 - 82%和55%的DV。使用SD%M的所有部分测量方案解释的DV均>90%。随着测量次数减少，A%M和SD%M的一致性界限变宽。
结论
每日测量次数较少时获得的DV与5次测量获得的结果一致性较差。如果从较少读数评估DV，SD%M是更好的选择。
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