Table 1. Correlation matrix between age and body mass index, mean systolic and diastolic blood pressure in two measurements.

Variables	Age	First systolic blood pressure	First diastolic blood pressure	Second systolic blood pressure
					Second diastolic blood pressure	Body mass index
Age	1
First systolic blood pressure	0.143*	1
First diastolic blood pressure	-0.82	0.393*	1
Second systolic blood pressure	0.158*	0.638**	0.481**	1
Second diastolic blood pressure	0.032	0.425**	0.657**	0.550**	1
Body mass index	-0.0960	-0.0290	0.004	0.07	0.055	1

^**Level of significance 0.001, ^*Level of significance 0.05