Table 1

 Demographics of employed, potential participants based on completion of office and serial spirometry

Completed neither office nor serial spirometryCompleted office spirometry
Did not complete serial spirometryCompleted serial spirometry
*p<0.05 for comparison with those who completed neither office nor serial spirometry.
n2048395
Female (%)646671
Mean age (years)33.533.634.2
White (%)959394
Ever smoked (%)4928*34*
Atopy (%)646368
Moderate asthma (%)373551*