Table 1.
Characteristics of the MZ and DZ twin study populations, Body mass index (BMI) and other continuous variables with a normal distribution are represented by the mean and standard deviation and those with a non-normal distribution are represented by the median, interquartile range (age). † The results of the non-parametric Mann-Whitney U-test are displayed. For all other continuous variables, the independent-sample t-test was used to determine the p-value. p-values are obtained for dichotomous variables using the Chi-square test. Asterisks (*) are used to indicate significant results.
| Characteristics | Total (n = 120) |
MZ (n = 86) |
DZ (n = 34) |
p-Value |
|---|---|---|---|---|
| Zygosity (nMZ:nDZ) | 86:34 | - | - | - |
| Sex (male:female) | 33:87 | 22:64 | 11:23 | 0.45 |
| Age (years) | 50 ± 26.5 | 46 ± 23 | 64 ± 29 | 0.03 †* |
| BMI, kg/m2 | 24.4 ± 4.3 | 24.3 ± 4.6 | 24.7 ± 3.4 | 0.68 |
| Smoking n(%) | 12(14.0) | 9(15.3) | 3(11.1) | 0.75 |
| Diabetes n(%) | 7(8.1) | 4(6.8) | 3(11.1) | 0.67 |
| Hypertension n(%) | 24(27.9) | 15(25.4) | 9(33.3) | 0.45 |
| Hyperlipidemia n(%) | 22(25.6) | 16(27.1) | 6(22.2) | 0.79 |
| COPD n(%) | 9(7.5) | 7(8.14) | 2(5.9) | 0.67 |
| Thyroid disorders n(%) | 24(20) | 16(18.6) | 8(23.5) | 0.54 |