Table 4

Percentage of population defined as exhibiting lung function below the lower limit of normal (LLN) in “healthy” and whole populations using the Health Survey for England (HSE) and European Coal and Steel Community (ECSC) reference curves by sex and age group#

Age yrsHSEECSC+
HealthyWholeHealthyWhole
FEV1FVCFEV1FVCFEV1FVCFEV1FVC
Males
 18–244.94.67.47.74.33.05.85.1
 25–345.85.08.87.43.12.65.54.5
 35–446.36.012.58.82.62.66.34.5
 45–543.55.115.110.20.51.68.35.4
 55–643.13.817.712.71.21.512.08.9
 65–707.57.522.817.15.73.818.113.0
 All5.25.213.410.02.62.48.46.2
Females
 18–244.75.89.77.81.73.35.14.9
 25–344.65.79.17.22.41.94.33.4
 35–446.34.412.59.51.90.95.13.4
 45–545.15.413.810.11.70.75.32.8
 55–645.36.717.513.91.71.28.94.8
 65–704.85.317.813.81.01.09.65.5
 All5.25.512.99.91.91.45.93.9
  • #: range restricted to 18–70 yrs, as recommended for the ECSC prediction equations, to permit comparison

  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • : LLN computed from mean lung function=eb0+b1A+b2A2+b3ln H

  • coefficient values given in table 2

  • +: LLN computed from mean – 1.645σ