Abstract 12601: Intelligence in Late Adolescence is Inversely Associated with Waist-Hip-Ratio in Early Middle-Age
Introduction: Body mass index (BMI) and waist-hip-ratio (WHR), measuring different kinds of obesity, are well-known risk factors for cardiovascular events. Intelligence (IQ) is known to predict BMI, but the association with WHR is not known. Hypothesis: Men with low IQ-values measured in late adolescence tend to have higher WHR in early middle-age than those with high IQ.
Methods: During the years 1990-1999, men and women living in the county of Västmanland, Sweden, were invited to a health survey, the Westmannia Cardiovascular Risk Factors Study (WICTORY), close to their 40th or 50th birthday. Of 51,000 invited persons, 34,400 (60%) took part in the survey, which among other variables measured waist and hip circumference. Among 40 year old men who participated in the survey, 5,380 persons had taken an IQ test during the mandatory Swedish conscription examination at a mean (sd) age of 18.1 (1.0) years, 21.0 (1.0) years before the survey. The results of the IQ test were standardized to a normal distribution score with nine levels. WHR was calculated as waist circumference divided by hip circumference. The association between WHR and IQ was measured using ANOVA and linear regression, with the latter adjusted for BMI, age and blood pressure at conscription examination, county of birth, mother's age at birth and time from conscription examination to health survey. P-values<0.05 were considered statistically significant.
Results: WHR among middle-aged men differed significantly between IQ levels (p<0.001). The association was inverse, with the highest mean (sd) WHR value 0.91 (0.06) for the men with lowest IQ and the lowest value 0.88 (0.06) for the men with highest IQ (see figure). The results were robust when adjusting for confounding factors in a linear regression model.
Conclusions: Waist-hip-ratio, a well known risk factor for CVD, was among men inversely correlated with intelligence in late adolescence, which motivates more focus on this group in the future.
- © 2011 by American Heart Association, Inc.