Table 5 Summary of the multivariate model.

Model	Predictors	R	R2	R2 change	Residual SD
1	Age	0.469	0.220	0.220
	Age, BMI	0.586	0.343	0.123	1.89
	Age, BMI, sex	0.624	0.390	0.047
	Age, BMI, sex, height	0.630	0.397	0.007
2	Age, BMI, sex, height, diuretic	0.650	0.423	0.026	1.85
3	Age, BMI, sex, height, diuretic, GTN	0.662	0.439	0.016	1.82
4	Age, BMI, sex, height, diuretic, GTN, digoxin	0.671	0.450	0.011	1.80
5	Age, BMI, sex, height, diuretic, GTN, digoxin, systolic BP	0.677	0.458	0.008	1.79

BMI, body mass index; BP, blood pressure; GTN, glyceryl trinitrate.