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Table 1 Characteristics of the study population according to the BP level

From: Renin-angiotensin system gene polymorphisms and high blood pressure in Lithuanian children and adolescents

Characteristics HBP (n = 274) NBP (n = 435) P value
Age, years, mean (SD) 13.30 (1.13) 13.26 (1.15) 0.647
SBP, mm Hg, mean (SD) 137.03 (10.89) 110.94 (7.35) <0.001
DBP, mm Hg, mean (SD) 70.17 (8.20) 62.25 (6.59) <0.001
BMI, kg/m2, mean (SD) 21.31 (3.54) 18.68 (2.81) <0.001
WC, cm, mean (SD) 72.27 (9.05) 64.58 (6.89) <0.001
Weight, kg, mean (SD) 58.71 (12.41) 49.26 (10.77) <0.001
Height, cm, mean (SD) 165.48 (8.82) 161.67 (9.65) <0.001
Sex, n (%)
 Boys 169 (47.9) 184 (52.1) <0.001
 Girls 105 (29.5) 251 (70.5)  
Age, years, n (%)
 12–13 156 (36.9) 267 (63.1) 0.240
 14–15 118 (41.3) 168 (58.7)  
BMI categories, n (%)
 Normal weight 195 (33.0) 396 (67.0) <0.001
 Overweight 58 (62.4) 35 (37.6)  
 Obesity 21 (84.0) 4 (16.0)  
WC percentile categories, n (%)
  < 75th 204 (33.2) 411 (66.8) <0.001
 75th–<90th 48 (69.6) 21 (30.4)  
  ≥ 90th 21 (87.5) 3 (12.5)  
  1. The means were compared using the t test
  2. Categorical variables were compared using the chi-square (χ2) test
  3. Abbreviations: NBP normal blood pressure, HBP high blood pressure, SBP systolic blood pressure, DBP diastolic blood pressure, BMI body mass index, WC waist circumference, SD standard deviation