Table 2

Self-reported respiratory symptom and disease prevalence in adults for the AHS and NHANES, 2005–2010

Respiratory outcomeAHSNHANESPrevalence ratio
Prevalence95% CIPrevalence95% CIPR95% CI
All adult participants (%)Adj for age, race, gender, BMI, Smk
Diseases
 Asthma ever7.26.97.413.813.314.30.540.490.59
 Asthma—adult-onset4.34.14.56.05.66.40.650.570.74
 Chronic bronchitis3.53.33.75.75.46.10.530.450.62
 Emphysema1.41.31.51.81.62.00.550.450.67
 COPD1.31.21.4NA
 Any obstructive disease*5.14.95.3NA
 Farmer's lung1.21.11.3NA
Symptoms
 Wheeze20.119.720.514.113.514.61.661.511.82
 Cough12.712.413.0NA
 Phlegm10.410.110.7NA
 Shortness of breath24.223.824.6NA
 Chronic cough and phlegm†4.03.84.2NA
Participants 40 and older (%)
Diseases
 Asthma ever7.27.07.512.712.013.30.570.510.64
 Asthma—adult-onset4.44.24.67.46.97.90.650.570.75
 Chronic bronchitis3.63.43.87.06.67.50.540.450.63
 Emphysema1.41.31.52.72.43.10.550.450.67
 COPD1.41.31.5NA
 Any obstructive disease*5.25.05.4NA
 Farmer's lung1.21.11.3NA
Symptoms
 Wheeze20.019.620.414.914.215.51.601.441.77
 Cough12.812.513.111.510.912.11.161.041.31
 Phlegm10.510.210.89.59.010.11.141.031.26
 Shortness of breath24.624.225.132.331.533.20.710.650.77
 Chronic cough and phlegm4.03.84.25.14.75.50.790.700.90
  • NA, not collected in NHANES (farmer's lung and COPD).

  • Cough, phlegm and shortness of breath only collected for those 40 and older.

  • *Includes chronic bronchitis, emphysema and COPD.

  • †Chronic cough and phlegm defined as cough and phlegm for at least 2 years.

  • AHS, Agricultural Health Study; BMI, body mass index; COPD, chronic obstructive pulmonary disease; NHANES, National Health and Nutrition Examination Survey; PR, prevalence ratio.