Table 3.

Effect of combinations of dietary variables on education–BP inverse relationship: all 2195 US INTERMAP participants

Row	Variablesa in multiple linear regression model	SBP	DBP
A	Model 2: Education, age, sample, ethnicity (African-American),	−0.4122a	−0.1920a
	CVD disease/diabetes diagnosis, special diet, gender	(−4.098)a	(−2.788)a
B	Model 3: Model 2 + BMI	−0.2646	−0.1073
		(−2.752)	(−1.606)
		−35.8%b	44.1%b
C	Model 3+24-h urinary Na and 24-h urinary K	−0.2315	−0.0910
		(−2.378)	(−1.344)
		−43.8%b	−52.6%b
		−12.5%c	−15.2%c
D	Model 3+24-h urinary Na and 24-h urinary K, 14-day	−0.2210	−0.0861
	alcohol intake (g/day)	(−2.279)	(−1.274)
		−46.4%	−55.2%
		−16.5%	−19.8%
E	Model 3+macronutrients: Vegetable Protein and Keys score	−0.2166	−0.0802
		(−2.234)	(−1.188)
		−47.5%	−58.2%
		−18.1%	−25.3%
F	Model 3+Minerals: Mg, Ca, P, Fe	−0.2138	−0.0902
		(−2.203)	(−1.337)
		−48.1%	−53.0%
		−19.2%	−15.9%
G	Model 3+fibre and vitamins: C, B6, folate, thiamin, riboflavin	−0.2151	−0.0947
		(−2.207)	(−1.396)
		−47.8%	−50.7%
		−18.7%	−11.7%
H	Model 3 + 24-h urinary Na and K, 14-day alcohol intake,	−0.1901	−0.0684
	Vegetable protein, and Keys dietary lipid score	(−1.950)	(−1.006)
		−53.9%	−64.4%
		−28.2%	−36.3%
I	Model 3+ 24-h urinary Na and K, 14-day alcohol intake,	−0.1753	−0.0633
	Vegetable protein, Keys dietary lipid score, Mg, Ca, P, Fe	(−1.795)	(−0.931)
		−57.5%	−67.0%
		−33.7%	−41.0%
J	Model 3+ 24-h urinary Na and K, 14-day alcohol intake,	−0.1886	−0.0784
	Vegetable protein, Keys dietary lipid score, fibre, vitamins C, B6,	(−1.931)	(−1.152)
	Folate, thiamin, riboflavin	−54.2%	−59.2%
		−28.7%	−26.9%

^aUnits for dietary variables as in Table 2.

^{^}Coefficient for the education–BP inverse relation in this multiple linear regression model.

^XZ-score.

^bPercent reduction in education-SBP coefficient compared to Model 2.

^cPercent reduction in education-SBP coefficient compared to Model 3.