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Table 3 Comparison of BP levels among the quartile groups by sodium intake measured by 24-h urine sample in general linear models

From: Relationship between nocturnal blood pressure and 24-h urinary sodium excretion in a rural population in Korea

Variable Sodium excretion quartiles pfor analysis of variance pfor trend
Q1 (<2.65 g) Q2 (2.65–3.8 g) Q3 (3.8–5.25 g) Q4 (>5.25 g)
Unadjusted       
  Casual SBP 119.7 ± 2.7 125.1 ± 2.7 120.4 ± 2.7 126.1 ± 2.7 0.22 0.22
  Casual DBP 72.0 ± 1.9 75.4 ± 1.9 71.3 ± 1.9 76.7 ± 1.9 0.13 0.23
  Daytime SBP 127.2 ± 2.2 131.3 ± 2.2 132.9 ± 2.2 133.6 ± 2.2 0.17 0.038
  Daytime DBP 78.1 ± 1.4 83.3 ± 1.4 84.2 ± 1.4 83.1 ± 1.4 0.011 0.0127
  Nighttime SBP 102.9 ± 2.6 113.8 ± 2.6 109.4 ± 2.6 115.8 ± 2.6 0.0034 0.0039
  Nighttime DBP 64.2 ± 1.7 71.4 ± 1.7 68.7 ± 1.7 72.8 ± 1.7 0.003 0.0023
Adjusted for age and sex       
  Casual SBP 122.6 ± 2.7 126.7 ± 2.6 119.3 ± 2.6 125.4 ± 2.6 0.19 0.95
  Casual DBP 73.8 ± 2.0 76.6 ± 1.9 70.6 ± 1.8 76.3 ± 1.9 0.09 0.85
  Daytime SBP 127.0 ± 2.3 131.1 ± 2.3 133.0 ± 2.2 133.6 ± 2.2 0.19 0.0413
  Daytime DBP 78.2 ± 1.5 83.3 ± 1.4 84.2 ± 1.4 83.1 ± 1.4 0.018 0.019
  Nighttime SBP 104.4 ± 2.7 114.6 ± 2.6 108.8 ± 2.6 115.5 ± 2.6 0.01 0.0275
  Nighttime DBP 65.9 ± 1.7 72.0 ± 1.7 68.1 ± 1.7 72.4 ± 1.6 0.0148 0.0455
Adjusted for age, sex, and MetS       
  Casual SBP 124.5 ± 2.7 127.8 ± 2.6 120.8 ± 2.6 125.2 ± 2.5 0.29 0.68
  Casual DBP 75.1 ± 2.0 77.4 ± 1.9 71.9 ± 1.9 76.1 ± 1.8 0.18 0.78
  Daytime SBP 127.9 ± 2.4 131.6 ± 2.2 133.6 ± 2.3 133.5 ± 2.2 0.28 0.075
  Daytime DBP 79.0 ± 1.5 83.7 ± 1.4 84.8 ± 1.4 83.0 ± 1.4 0.034 0.055
  Nighttime SBP 105.7 ± 2.8 115.4 ± 2.6 110.2 ± 2.7 115.2 ± 2.6 0.03 0.065
  Nighttime DBP 66.6 ± 1.8 72.5 ± 1.7 68.8 ± 1.7 72.3 ± 1.7 0.036 0.089
  1. BP blood pressure, SBP systolic blood pressure, DBP diastolic blood pressure, MetS score the summed number of abnormal criteria for metabolic syndrome except for BP.