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Table 1 Clinical and laboratory findings of 63 monozygotic (MZ) and 38 dizygotic (DZ) twin pairs (x ± SD or %)

From: Effect of genetic and environmental influences on cardiometabolic risk factors: a twin study

  MZ twins
(n = 126)
DZ twins
(n = 76)
p value
Women (%) 73.0 71.1 0.832
Age (years) 47.4 ± 15.5 38.3 ± 13.5 < 0.001
Duration of smoking (years) 4.8 ± 9.5 4.8 ± 9.6 0.829
Alcohol consumption (unit/week) 1.1 ± 2.2 1.9 ± 3.4 0.553
Physical activity (MET/24 hours) 65.8 ± 22.2 60.3 ± 21.1 0.094
Weight (kg) 71.1 ± 14.5 72.4 ± 17.6 0.827
Height (cm) 165 ± 9 167 ± 9 0.211
Body mass index (kg/m 2 ) 25.9 ± 4.9 25.8 ± 5.9 0.576
Waist circumference (cm) 88 ± 14 88 ± 16 0.757
Systolic blood pressure (mmHg) 130.2 ± 14.8 125.3 ± 14.1 0.026
Diastolic blood pressure (mmHg) 74.7 ± 10.3 72.6 ± 9.8 0.152
Serum total cholesterol (mmol/l) 5.35 ± 1.23 5.00 ± 1.07 0.031
Serum HDL-cholesterol (mmol/l) 1.60 ± 0.39 1.60 ± 0.36 0.755
Serum triglycerides (mmol/l) 1.33 ± 0.86 1.07 ± 0.80 0.004
Fasting blood glucose (mmol/l) 5.01 ± 0.75 4.81 ± 0.63 0.064
Fasting insulin (μU/ml) 7.35 ± 5.15 6.83 ± 4.64 0.665
HOMA-IR 1.70 ± 1.39 1.53 ± 1.29 0.404
Serum creatinine (μmol/l) 70.0 ± 9.8 72.3 ± 11.4 0.219
Serum uric acid (μmol/l) 286.3 ± 75.3 282.2 ± 74.8 0.584
Fibrinogen (g/l) 3.27 ± 0.69 3.18 ± 0.72 0.219
Serum homocysteine (μmol/l) 12.1 ± 5.64 10.9 ± 2.9 0.408
Serum C-reactive protein (mg/l) 3.82 ± 6.53 4.27 ± 5.01 0.871
  1. MET: metabolic equivalent score
  2. HOMA-IR: homeostatis model assessment insulin resistance