Table 2

Prediction equations for the means of lung function variables

Men
FVC (l)= exp (− 10.321 + 2.1685 ln (H) + 0.0655A − 0.001325A2) (A⩽25)
= exp  (− 9.540 + 2.1685 ln (H) + 0.0030A − 0.000075A2) (A>25)
FEV1 (l)= exp  (− 9.280 + 1.9095 ln (H) + 0.0795A − 0.001698A2) (A⩽25)
= exp  (− 8.240 + 1.9095 ln (H) − 0.0037A − 0.000033A2) (A>25)
PEF (l/s)= exp  (− 6.189 + 1.2965 ln (H) + 0.1379A − 0.002731A2) (A⩽25)
= exp  (− 4.548 + 1.2965 ln (H) + 0.0066A − 0.000106A2) (A>25)
MEF25–75 (l/s)= exp  (− 3.205 + 0.9457 ln (H) − 0.0025A − 0.000137A2)
MEF75(l/s)= exp  (− 4.440 + 0.9869 ln (H) + 0.1188A − 0.002404A2) (A⩽25)
= exp  (− 2.968 + 0.9869 ln (H) + 0.0011A − 0.000050A2) (A>25)
MEF50 (l/s)= exp  (− 2.510 + 0.8156 ln (H) + 0.0012A − 0.000119A2)
MEF25(l/s)= exp  (− 4.474 + 1.1258 ln (H) − 0.0165A − 0.000120A2)
FEV1/FVC= exp  (1.526 − 0.3144ln (H) − 0.0033A)
Women
FVC (l)= exp  (− 9.457 + 2.0966 ln (H) + 0.0091A − 0.000152A2)
FEV1(l)= exp  (− 8.217 + 1.8475 ln (H) + 0.0035A − 0.000130A2)
PEF (l/s)= exp  (− 5.790 + 1.4902 ln (H) + 0.0042A − 0.000082A2)
MEF25–75(l/s)= exp  (− 3.247 + 0.9020 ln (H) + 0.0044A − 0.000240A2)
MEF75(l/s)= exp  (− 4.048 + 1.1453 ln (H) + 0.0020A − 0.000068A2)
MEF50(l/s)= exp  (− 2.332 + 0.7376 ln (H) + 0.0045A − 0.000166A2)
MEF25(l/s)= exp  (− 4.757 + 1.1220 ln (H) − 0.0035A − 0.000319A2)
FEV1/FVC= exp  (1.283 − 0.2640 ln (H) − 0.0037A)
  • A = age (years); H = height (cm); exp(x) = ex

  • For a man of 20 years and 180 cm the predicted value of FEV1 is computed as follows:

  • FEV1 = e (−9.280 + 1.9095 *  In (180) + 0.0795 *20—0.001698 * 400) = e1.547 = 4.696.