A Study conducted in a population. Diastolic Blood Pressure mean 110 mm Hg with SD of 11 mm Hg, Vitamin D mean 18 ng/ml with SD of 3 ng/ml. what is the relation between the two variance
(A) Variance of Vitamin D > DBP (B) Variance of DBP > 4 times Vitamin D (C) Data insufficient to comment upon (D) None
(B) Ans.b). Variance of DBP > 4 times Vitamin DCoefficient of Variance (CV) is a tool to compare variability of two different characteristics (eg. BP, serum creatinine, height weight etc.) in the same group of subjects or compare variability of the same character in two or more different groups.Thus it is a measure used to compare relative variability.For example, coefficient of variance measureswhether weight varies more than height in a group of studentwhether weight varies more in girls of boys. Calculation:CV= standard detion x 100/ meanFor Blood pressure- 110x100/11=1000For Vitamin D- 3X100/18= 16.7