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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.