TABLE 2.
Phenotypic correlation coefficients (95% confidence intervals) with covariates’ effects in MZ and DZ twin pairs
| Model | Correlation | Model testing | |||||
|---|---|---|---|---|---|---|---|
| MZ | DZ | −2LL | df | χ 2 | p | ||
| SBP | Base | 0.53 (0.44–0.61) | 0.30 (0.14–0.44) | 1893.3 | 753 | — | — |
| Drop age | 0.57 (0.48–0.64) | 0.36 (0.20–0.49) | 1936.6 | 754 | 43.3 | <0.01 | |
| Drop sex | 0.57 (0.48–0.64) | 0.36 (0.20–0.49) | 1922.6 | 754 | 29.3 | <0.01 | |
| Drop BMI | 0.53 (0.44–0.61) | 0.31 (0.14–0.44) | 1946.5 | 754 | 53.2 | <0.01 | |
| DBP | Base | 0.50 (0.40–0.58) | 0.28 (0.11–0.43) | 1943.9 | 753 | — | — |
| Drop age | 0.50 (0.40–0.58) | 0.28 (0.11–0.43) | 1944.7 | 754 | 0.8 | 0.37 | |
| Drop sex | 0.54 (0.45–0.62) | 0.34 (0.17–0.48) | 1984.3 | 754 | 40.4 | <0.01 | |
| Drop BMI | 0.48 (0.38–0.57) | 0.30 (0.14–0.44) | 2003.2 | 754 | 59.4 | <0.01 | |
| PP | Base | 0.47 (0.37–0.56) | 0.29 (0.14–0.42) | 1956.7 | 753 | — | — |
| Drop age | 0.53 (0.44–0.62) | 0.37 (0.23–0.49) | 2022.5 | 754 | 65.7 | <0.01 | |
| Drop sex | 0.48 (0.38–0.57) | 0.30 (0.15–0.43) | 1961.9 | 754 | 5.1 | 0.023 | |
| Drop BMI | 0.48 (0.38–0.57) | 0.29 (0.14–0.42) | 1971.2 | 754 | 14.5 | <0.01 | |
| MAP | Base | 0.53 (0.44–0.61) | 0.27 (0.09–0.41) | 1912.3 | 753 | — | — |
| Drop age | 0.55 (0.45–0.62) | 0.29 (0.12–0.44) | 1928.6 | 754 | 16.3 | <0.01 | |
| Drop sex | 0.57 (0.49–0.65) | 0.34 (0.17–0.48) | 1951.6 | 754 | 39.2 | <0.01 | |
| Drop BMI | 0.52 (0.43–0.60) | 0.28 (0.11–0.42) | 1979.6 | 754 | 67.2 | <0.01 | |
Abbreviations: −2LL, −2 Log Likelihood; BMI, body mass index; DBP, diastolic blood pressure; df, degree of freedom; DZ, dizygotic; MAP, mean arterial pressure; MZ, monozygotic; PP, pulse pressure; SBP, systolic blood pressure.