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Table 3 Sex specific tracking correlation coefficients for blood pressure from 5 to 18 years of age

From: Blood pressure tracking in urban black South African children: birth to twenty cohort

Correlation between two mean age categories

Systolic BP

Diastolic BP

 

Boys

Girls

Boys

Girls

 

Crude

Adjusted

Crude

Adjusted

Crude

Adjusted

Crude

Adjusted

5–8

0.26***

0.22***

0.39***

0.33***

0.19***

0.18***

0.21***

0.17***

5–13

0.28***

0.20***

0.27***

0.20***

0.24***

0.21***

0.20***

0.17***

5–14

0.25***

0.20***

0.16***

0.16***

0.22***

0.22***

0.15***

0.13***

5–16

0.22***

0.20***

0.25***

0.23***

0.23***

0.26***

0.26***

0.25***

5–18

0.23***

0.19***

0.18***

0.13**

0.23***

0.25***

0.15***

0.14**

Average

0.25

0.20

0.30

0.21

0.22

0.22

0.19

0.17

8–13

0.42***

0.38***

0.43***

0.38***

0.25***

0.20***

0.32***

0.26***

8–14

0.42***

0.41***

0.43***

0.39***

0.28***

0.31***

0.36***

0.36***

8–16

0.27***

0.30***

0.40***

0.44***

0.18***

0.17***

0.31***

0.30***

8–18

0.29***

0.29***

0.34***

0.29***

0.22***

0.22***

0.27***

0.28***

Average

0.35

0.35

0.40

0.38

0.23

0.23

0.32

0.30

13–14

0.53***

0.61***

0.60***

0.61***

0.53***

0.55***

0.58***

0.62***

13–16

0.50***

0.57***

0.42***

0.49***

0.39***

0.43***

0.41***

0.44***

13–18

0.50***

0.53***

0.41***

0.40***

0.36***

0.39***

0.47***

0.49***

Average

0.51

0.57

0.47

0.50

0.42

0.46

0.49

0.51

14–16

0.53***

0.57***

0.47***

0.54***

0.48***

0.51***

0.46***

0.49***

14–18

0.47***

0.45***

0.54***

0.44***

0.39***

0.39***

0.48***

0.48***

Average

0.50

0.51

0.51

0.49

0.43

0.45

0.47

0.49

16–18

0.46***

0.36***

0.44***

0.34***

0.37***

0.34***

0.45***

0.42***

  1. Simple and multiple linear regressions adjusted for BMI-age z score. Significant at **p < 0.01 ***p < 0.001