Scheinhorn D J
South Med J. 1982 Apr;75(4):434-8. doi: 10.1097/00007611-198204000-00014.
Forced expiratory time (FET), the time in seconds required to exhale the vital capacity forcefully, was examined as a self-test for airflow limitation. Following only written instructions, 180 subjects measured their own FET. Neither laboratory equipment nor personnel were used. Results were compared with usual spirometric measurements of airflow limitation. Correlation between FET and spirometric measurements was significant. No training effect was evident after a coached spirogram, indicating adequacy of effort and understanding in the performance of the FET test. An FET of greater than five seconds was significantly associate with spirometric abnormality. The FET test missed significant airflow limitation in 9% of subjects, and misclassified 14% of subjects as abnormal. This self-test FET is sensitive enough to warrant field trials.
用力呼气时间（FET），即用力呼出肺活量所需的时间（以秒为单位），作为气流受限的自我检测指标进行了研究。仅按照书面说明，180名受试者自行测量了他们的FET。未使用实验室设备和人员。将结果与气流受限的常规肺量计测量结果进行了比较。FET与肺量计测量结果之间的相关性显著。在接受指导的肺量图检查后，未发现明显的训练效果，这表明在进行FET测试时努力程度和理解能力足够。FET大于5秒与肺量计异常显著相关。FET测试在9%的受试者中遗漏了明显的气流受限，并且将14%的受试者误分类为异常。这种自我检测的FET足够灵敏，值得进行现场试验。
