Table 3

Estimated incident rates for respiratory diseases in the AHS and NHANES using age at diagnosis to estimate person time of follow-up

DiseaseAHS (N=43 548)NHANES
Incidence rate95% CIIncidence rate95% CI
N/1000 PYN/1000 PY
Asthma2.12.02.24.04.04.0
Chronic bronchitis1.21.11.32.12.12.1
Emphysema0.80.70.91.11.11.1
COPD0.90.81.0NR
Farmer's lung0.30.30.4NR
Any obstructive disease*2.12.02.2NR
Non-smokers
Asthma1.81.72.03.43.43.4
Chronic bronchitis0.80.80.91.31.31.3
Emphysema0.20.10.20.10.10.1
COPD0.30.30.4NR
Farmer's lung0.30.20.3NR
Any obstructive disease*1.21.01.3NR
Smokers
Asthma2.62.42.94.74.74.7
Chronic bronchitis2.01.82.32.92.92.9
Emphysema2.11.92.42.32.32.3
COPD2.01.82.2NR
Farmer's lung0.50.40.6NR
Any obstructive disease*4.23.94.5NR
Men
Asthma1.71.51.92.62.62.6
Chronic bronchitis1.11.01.21.31.31.3
Emphysema1.11.01.21.11.11.1
COPD1.00.91.2NR
Farmer's lung0.60.50.7NR
Any obstructive disease*2.32.12.5NR
Women
Asthma2.52.32.75.45.45.4
Chronic bronchitis1.41.31.62.82.82.8
Emphysema0.40.40.51.21.21.2
COPD0.70.60.8NR
Farmer's lung0.10.00.1NR
Any obstructive disease*1.91.72.0NR
40
Asthma2.12.02.23.53.53.5
Chronic bronchitis1.21.11.32.42.42.4
Emphysema0.80.70.91.71.71.7
COPD0.90.81.0NR
Farmer's lung0.30.30.4NR
Any obstructive disease*2.22.02.3NR
  • NR, not reported in the NHANES.

  • *COPD, emphysema, and chronic bronchitis.

  • AHS, Agricultural Health Study; COPD, chronic obstructive pulmonary disease; NHANES, National Health and Nutrition Examination Survey; PY, person-years.