Table 1

Estimation of model 1 coefficients from data in fig 1: typical software output

FEV₁	Coefficient	Std error	t statistic	Probability	95% CI
Mean Square Error, that is, SD(r) = 0.464 litres.
Age	−0.0301	0.0032	−9.52	<0.001	−0.0363 to −0.0238
Constant	5.5803	0.1440	38.75	<0.001	5.2960 to 5.8647