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© 1988 Oxford University Press

research-article

Biological and Environmental Sources of Familial Aggregation of Blood Pressure: The Jerusalem Lipid Research Clinic

Y FRIEDLANDER*,{dagger},{ddagger}, J D KARK*,{ddagger} and Y STEIN*,{dagger}

*The Jerusalem Lipid Research Clinic. Hadassah University Hospital Ein Kerem. Jerusalem. Israel
{dagger}Department of Medicine B. Hadassah University Hospital Ein Kerem, Jerusalem
{ddagger}Department of Social Medicine, Hebrew Univcrsity-Hadnssah School of Public Health and Community Medicine, Faculty of Medicine Jerusalem

Genetic and cultural determinants of systolic blood pressure (SBP) and diastolic blood pressure (DBP) were estimated using a path model on a sample of families examined in the Jerusalem Lipid Research Clinic. This model involves 10 parameters to be estimated from a total of 16 correlations (leaving ample degrees of freedom to test the goodnessof ft). The general model fitted SBP (X2(8) = 6.95, p = 0.33) and DBP (X2(8) =5.44, p =.49) very well. Both genetic (h2) and cultural (c2) components of inheritance were statistically significant for both blood pressure variables. Under the most parsimonious model, genetic herrtabilrtes (h2) were estimated to be 0.20 and 0.28 for SBP and DBP respectively. Cultural herrtability (c2) was 0.12 for SBP and 0.08 for DBP. A significant fraction of the estimate for cultural inheritance was due to a sibling environmental effect not mediated through their parents. Within this population genetic factors, common environmental factors and concomitant variables such as sex, age and origin explained about 40% of blood pressure variability. Most of the variance appears to be due to unmeasured environmental factors and errors of measurement

Revised 1 February 1987


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