Provide a 95% confidence interval for the correlation coefficient.

The mean ± sd for waist circumference was 72.8 ± 7.8 cm.

The mean ± sd for HDL-C was 20.7 ± 4.1 mg/dl. 

Cardiovascular Disease

The STRIP study (Special Turku Coronary Risk Factor Intervention Project for Children) is a longitudinal randomized prevention trial where repeated dietary counseling aiming at reducing intake of saturated fat took place from infancy to age 7 (Nupponen et al.) [17]. Subjects who had complete data on components of the metabolic syndrome (MetS) (waist circumference, blood pressure, triglycerides, glucose, and HDL cholesterol) at ages 15–20 were included in the study. There was an intervention group who received dietary counseling and a control group who received only standard clinical care.

One of the goals of the study was to look at the correlation among components of the MetS. The correlation coefficient between waist circumference and HDL-cholesterol (HDL-C) was –0.24 among the 243 subjects in the intervention arm.