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Table 1 Principal component analysis for five SBP values (SBP1-SBP5) and hypertension phenotypes (HBP1-HBP5), respectivelyA

From: Genetic linkage analysis of longitudinal hypertension phenotypes using three summary measures

Principal component

Eigenvalue

Proportion of variance

Cumulative proportion of variance

Coefficient

SBP

   

SBP1

SBP2

SBP3

SBP4

SBP5

   PRIN1

2.862

0.573

0.573

0.36

0.46

0.49

0.47

0.43

   PRIN2

0.767

0.153

0.726

0.83

0.20

-0.14

-0.35

-0.37

   PRIN3

0.565

0.113

0.839

0.36

-0.52

-0.33

-0.07

0.70

   PRIN4

0.436

0.087

0.926

-0.24

0.62

-0.24

-0.56

0.42

   PRIN5

0.368

0.074

1.000

0.00

0.29

-0.76

0.58

-0.90

HBP

   

HBP1

HBP2

HBP3

HBP4

HBP5

   PRIN1

1.991

0.398

0.398

0.33

0.44

0.52

0.51

0.41

   PRIN2

0.964

0.193

0.591

0.67

0.42

-0.08

-0.27

-0.54

   PRIN3

0.813

0.163

0.754

0.64

-0.50

-0.38

0.05

0.44

   PRIN4

0.661

0.132

0.886

-0.12

0.52

-0.28

-0.55

0.58

   PRIN5

0.571

0.114

1.000

0.13

-0.33

0.71

-0.60

0.10

  1. APrior to obtaining the principal components, all five SBPs and HBPs were adjusted for the effects of four covariates (sex, age, body mass index, and antihypertensive treatment) and were standardized.