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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