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用力肺活量(FVC)与第1秒时间肺活量(FEV_1)常用来衡量肺通气功能。但此测验需要重复多少次才能取得具有代表性的资料?应选择哪个或哪些数值进行分析才真正具有代表性?多年来尚未获得一致意见。本文通过对连续3年近3,000例肺通气功能普查资料的分析,探讨需要测定的次数和选择记录数据。被测对象年龄均在6岁以上,均以普查用的呼吸速率测定装置(field pneumotachygraphic device)记录由口呼出气体流速,以电子计算机处理,得出FEV_1和 FVC。最初2年,每例完成5次合格的 FVC测验,第3年仅要求作3次。依次获得近3,000例合格的 FVC 记录资料.测验在坐位进行。第1年部分测验未带鼻夹,其后2年使用了鼻夹。所有资料均经BTPS(体温、气压,水蒸气饱和度)矫正。通过多次运算求得以下数值并进行了对比:①5次测定中2个最大值的平均数,②前3次测定中2个最大值的平均数,③5次测定中的最大数,④前3次测验中的最大数。
Fetal vital capacity (FVC) and 1 second time vital capacity (FEV_1) commonly used to measure lung ventilation. But how many times does it take for this test to be representative? Which one or more values should be chosen for analysis is truly representative and has not been agreed for years. In this paper, we analyzed the data of nearly 3,000 pulmonary function tests in 3 consecutive years and discussed the number of times needed to be measured and the data of selective records. Subjects under the age of 6 years old were recorded by the field pneumotachygraphic device and exhaled gas flow rate was measured by computer processing to obtain FEV_1 and FVC. In the first 2 years, each case completed five eligible FVC tests, the third year only requires 3 times. Followed by nearly 3,000 cases of qualified FVC record data. Part 1 of the first year did not carry nose clips, followed by 2 years of nose clips. All data are BTPS (body temperature, pressure, water vapor saturation) correction. The following values were calculated by multiple calculations and compared: ① the average of the two maximum values in the five measurements, ② the average of the two maximum values in the three previous measurements, ③ the maximum number of the five measurements, and ④ the first three The maximum number of tests.