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Table 2 The hypertension prevalence rate (%) of relatives in case and control group

From: Familial aggregation and heritability of hypertension in Han population in Shanghai China: a case-control study

  Control group Case group x2 p
total disease prevalence total disease prevalence
First-degree relatives
 Parent 570 203 35.61 583 314 53.86 14.853 0.000
 Siblings 704 217 30.82 670 332 49.55 21.557 0.000
 Offspring 440 33 7.50 419 67 15.99 11.899 0.001
  1714 453 26.43 1672 713 42.64 48.167 0.000
Second- degree relatives
 Paternal siblings 791 123 15.55 802 168 20.95 5.375 0.020
 Maternal siblings 740 107 14.46 770 148 19.22 4.339 0.037
  1531 230 15.02 1572 316 20.10 9.635 0.002
Third-degree relatives
 Paternal cousin 176 14 7.95 175 32 18.29 6.330 0.012
 Maternal cousin 825 97 11.76 934 142 15.20 3.897 0.046
  1001 111 11.09 1109 174 15.69 7.282 0.007
Total 4246 794 18.70 4353 1203 27.64 83.649 0.000