Interviewer instructions
    
                                    INTERVIEWER:  Demonstrate how to do the lung function test.
INTERVIEWER: Make sure to show the respondent that you are using a clean mouthpiece on the spirometer before starting.  Take a short break in between each trial to give the respondent a chance to return to normal breathing.
We will ask you to practice once, then we will have you use it three times.  Okay, are you ready?  Take a deep breath, seal your lips around the mouthpiece and BLOW, BLOW, BLOW!