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Table 2 Correlation between VVV and demographic or blood pressure variablesb

From: School-based surveillance on visit-to-visit blood pressure variability and high blood pressure in children and adolescents

Characteristics SBP-SD SBP-ARV SBP-CV DBP-SD DBP-ARV DBP-CV
R2 P R2 P R2 P R2 P R2 P R2 P
Age, n (%)a 0.005 < 0.0001 0.002 < 0.0001 0.000 0.198 0.000 0.805 0.001 < 0.0001 0.000 0.647
Body mass indexa,b 0.003 < 0.0001 0.003 < 0.0001 0.000 0.118 0.001 < 0.0001 0.001 < 0.0001 0.000 0.335
Median BP measurement times 0.006 < 0.0001 0.001 0.089 0.000 0.101 0.001 < 0.0001 0.000 < 0.0001 0.000 0.462
SBP at first attendance of HPPCAb 0.002 0.069 0.005 < 0.0001 0.000 0.945 0.004 < 0.0001 0.004 < 0.0001 0.000 0.093
DBP at first attendance of HPPCAb 0.002 < 0.0001 0.003 < 0.0001 0.000 0.667 0.010 < 0.0001 0.012 < 0.0001 0.000 0.590
Mean SBP during 2012–2017b 0.001 < 0.0001 0.002 < 0.0001 0.000 0.150 0.005 < 0.0001 0.006 < 0.0001 0.000 0.052
Mean DBP during 2012–2017b 0.001 0.192 0.000 0.002 0.000 0.167 0.009 < 0.0001 0.011 < 0.0001 0.000 0.774
SBP-ARVc 0.743 < 0.0001  –  –  –  –  –
SBP-CVc 0.000 0.046 0.000 0.478  –  –  –  –
DBP-SDc 0.151 < 0.0001 0.101 < 0.0001 0.000 0.543  –  –  –
DBP-ARVc 0.094 < 0.0001 0.101 < 0.0001 0.000 0.871 0.746 < 0.0001  –  –
DBP-CVc 0.000 0.375 0.000 0.214 0.000 0.954 0.000 0.504 0.000 0.903  –
  1. VVV, visit to visit blood pressure variability; SBP, systolic blood pressure; DBP, diastolic blood pressure; SD, standard deviation; ARV, actual real variability; CV, coefficient of variation
  2. aAge and body mass index were measured when participants took examinations in 2018
  3. bAbsolute BP levels and BMI values were converted into z-scores
  4. cBP variability parameters were calculated based on BP z-scores during 2012–2017