Table 2.

Random-effects multiple regression analysis: predictors of blood pressure tracking correlation coefficients, based on all available data points regardless of sex

Predictors		SBP* (N= 617)			DBP* (N= 547)
		β	SE	P value	β	SE	P value
Intercept		−4.151	8.181	0.612	1.362	4.783	0.776
Sex	Male (reference)
	Female	−0.008	0.011	0.471	−0.029	0.011	0.009
	Males and females¶	0.019	0.018	0.299	−0.014	0.018	0.455
Baseline age (year)	0.012	0.001	<0.001	0.009	0.002	<0.001
Length of follow-up (year)	−0.008	0.001	<0.001	−0.005	0.001	<0.001
Number of BP measurement	Once (reference)
	Twice	0.216	0.119	0.070	0.122	0.069	0.078
	Three times or more	0.086	0.107	0.417	0.082	0.059	0.169
	Unknown†	0.060	0.127	0.634	−0.007	0.074	0.928
Publication year (year)		0.002	0.004	0.586	0.001	0.002	0.814
Race/population	European (reference)
	General American	0.095	0.088	0.280	0.055	0.061	0.367
	White American	0.035	0.079	0.655	−0.044	0.052	0.399
	African American	0.049	0.080	0.542	−0.013	0.055	0.818
	Asian	−0.061	0.095	0.517	−0.074	0.058	0.203
	Other‡	−0.166	0.117	0.156	−0.179	0.072	0.013
BP measurement technique	Mercury manometer (reference)
	Random-zero manometer	0.018	0.111	0.873	0.013	0.063	0.841
	Ultrasound device	−0.197	0.099	0.046	−0.065	0.063	0.304
	Automated device	0.071	0.142	0.617	0.223	0.080	0.005
	Unknown†	−0.001	0.079	0.994	0.032	0.053	0.546
R2		0.480	0.472

^*SBP: systolic blood pressure; DBP: diastolic blood pressure. Multiple linear regression models were fit for SBP and DBP, respectively.

^¶Some studies reported the overall tracking correlation coefficient for males and females combined.

^†Unknown: no detailed information available.

^‡Other: Australia, Canada, Israel, and New