. 2018 Jan 19;10(1):103. doi: 10.3390/nu10010103

Table 2.

Multiple linear regression analyses on the association of PRAL and potassium in sex-balanced quintiles as continuous predictor variables with blood pressure levels as continuous outcome variables in the total DEGS1 study sample (n = 6788).

		Total Sample (n = 6788)
Predictor	Outcome	β (95% CI)	P_trend	R²
	Systolic blood pressure
PRAL (FFQ), mEq/day	Basic model ^a	0.0486 (0.0216, 0.0756)	0.0005 ^c	0.1570
PRAL (FFQ), mEq/day	Adjusted model ^b	0.0521 (0.0250, 0.0792)	0.0002 ^c	0.1927
K-Intake (FFQ), g/day	Basic model ^a	−0.3327 (−0.7114, 0.0461)	0.08	0.1551
K-Intake (FFQ), g/day	Adjusted model ^b	−0.3969 (−0.7734, −0.0204)	0.04 ^c	0.1906
K-Excretion, mmol/day	Basic model ^a	−0.0119 (−0.0235, −0.0003)	0.04 ^c	0.1551
K-Excretion, mmol/day	Adjusted model ^b	−0.0330 (−0.0455, −0.0205)	<0.0001 ^c	0.1944
	Diastolic blood pressure
PRAL (FFQ), mEq/day	Basic model ^a	0.0119 (−0.0070, 0.0308)	0.2	0.1032
PRAL (FFQ), mEq/day	Adjusted model ^b	0.0148 (−0.0038, 0.0334)	0.1	0.1481
K-Intake (FFQ), g/day	Basic model ^a	−0.1727 (−0.4088, 0.0634)	0.2	0.1033
K-Intake (FFQ), g/day	Adjusted model ^b	−0.2546 (−0.4891, −0.0202)	0.03 ^c	0.1484
K-Excretion, mmol/day	Basic model ^a	−0.0069 (−0.0141, 0.0004)	0.06	0.1034
K-Excretion, mmol/day	Adjusted model ^b	−0.0154 (−0.0236, −0.0071)	0.0003 ^c	0.1500

^a Adjusted for age, sex, and BMI; ^b Basic model, additionally adjusted for size of blood pressure cuff, fasting duration (> or <8 h), smoking status, natrium excretion, alcohol intake, diuretics, beta-blockers, eGFR, serum glucose, and total cholesterol. ^c Bold numbers indicate significant p-values (<0.05); PRAL, potential renal acid load; DEGS1, German Health-Interview and Examination Survey for Adults; CI, confidence interval; FFQ, food frequency questionnaire; BMI, body mass index; eGFR, estimated glomerular filtration rate calculated according to the four-variable MDRD formula.