Skip to main content

Table 8 Sensitivity and Specificity of using the pre-bronchodilator and using the pre-bronchodilator with an added constant compared with the post-bronchodilator values

From: Can spirometric norms be set using pre- or post- bronchodilator test results in older people?

 

<70% using pre-bronchodilator

<70% using pre-bronchodilator + K

 

Sensitivity

Specificity

Youden’s index

Sensitivity

Specificity

Youden’s index

FEV1/FVC

90%

85%

0.75

79%

94%

0.73

  1. Results for 5246 subjects in the “non-normal” survey population. The participants included were those with adequate spirometry, but excluded from the estimation of normal values because of a history of smoking or of respiratory diagnosis or symptoms.
  2. Values of “K”: 2.76 (men); 2.59 (women).