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
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