1. Spirometry test quality, reported as a grade point average, for the pulmonary function technicians, in the first 40 months of the Lung Health Study.
Spirometry test quality, reported as a grade point average, for the pulmonary function technicians, in the first 40 months of the Lung Health Study. The horizontal arrow indicates the time of site visits by spirometry instructors, for repeat training of spirometry technicians at participating centers. The dashed line indicates the inception of technician monitoring and feedback. (From Reference 41; data from Reference 42.)‏
Jeffrey M Haynes Respir Care 2012;57:
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