Table 1 General characteristics and blood-pressure related variables of study subjects by gender

From: Genetic and environmental influences on blood pressure and body mass index in Han Chinese: a twin study

 

Male

Female

Sex difference, P

Subjects, n a

1092

984

 

Age, years

38.73±10.6

36.79±8.71

NS

Study site (Qingdao %)

47.5%

58.5%

<0.001

Zygosity (MZ %)

61.1%

58.7%

NS

BMI, kg m–2

22.9±3.02

23.0±3.39

NS

SBP, mm Hg

123.0±16.9

114.8±15.7

<0.001

DBP, mm Hg

82.6±11.1

77.3±10.4

<0.001

Antihypertensive medication useb

22 (1.99%)

17 (1.71%)

NS

  1. Abbreviations: BMI, body mass index; DBP, diastolic blood pressure; DZ, dizygotic; MZ, monozygotic; SBP, systolic blood pressure.
  2. Data are mean±s.d. unless stated otherwise.
  3. aEight singletons; 620 MZ and 414 DZ pairs; two missing values for BMI in male and one in female; one missing value (outlier) for SBP in male.
  4. bAntihypertensive medication use in the most recent 2 weeks.
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