Table 3. Development of new prediction equations for spirometry.

Variables		Men					Women
		Estimate	SE	t value	P value	r2	Estimate	SE	t value	P value	r2
FEV1						0.702					0.418
	Intercept	−2.40147	1.56054	−1.54	0.130		−1.32933	0.93219	−1.43	0.1575
	Age	−0.02134	0.00345	−6.19	< 0.001		−0.00872	0.00253	−3.44	0.0009
	Height	0.04103	0.00879	4.67	< 0.001		0.02762	0.00554	4.99	< 0.001
FVC						0.531					0.233
	Intercept	−4.38775	2.05482	−2.14	0.039		−3.09063	1.308857	−2.361	0.0205
	Age	−0.01184	0.00454	−2.61	0.013		0.003904	0.003558	1.097	0.2756
	Height	0.05547	0.01158	4.79	< 0.001		0.038694	0.007776	4.976	< 0.001
FEV1/FVC						0.500					0.500
	Intercept	0.889052	0.34126	2.61	0.013		0.667268	0.229033	2.91	0.0046
	Age	0.004455	0.000754	5.91	< 0.001		0.005535	0.000623	8.89	< 0.001
	Height	0.001	0.001923	0.52	0.606		0.001891	0.001361	1.39	0.1682

SE = standard error, FVC = forced vital capacity, FEV₁ = forced expiratory volume in 1 second.