Table 3 Comparison of mean per cent predicted Tlco in this sample using other published equations

	Mean Tlco %predicted		R2
	Males	Females	Males	Females
Present study	100	100	0.36	0.36
Roca1	90	85	0.44	0.37
Crapo4	82.5	80.3	0.6	0.6
Miller5	96.3	91.3	0.46	0.54
Paoletti6	79.4	74.8
Knudson7	78.6	77.1

Tlco, carbon monoxide diffusing capacity of the lung.