If the mean for BUN is 18.0 and one standard deviation is 0.13, what is the coefficient of variation?

To find the coefficient of variation (CV), you need to use the formula:

[ CV = \left( \frac{\text{Standard Deviation}}{\text{Mean}} \right) \times 100 % ]

In this case, the mean for BUN is 18.0 and the standard deviation is 0.13. Plugging these values into the formula gives:

[ CV = \left( \frac{0.13}{18.0} \right) \times 100 % ]

Calculating that yields:

[ CV = \left( 0.007222 \right) \times 100 % = 0.7222 % ]

Rounding this to one decimal place results in a coefficient of variation of approximately 0.7%.

The answer aligns with the correct choice because the coefficient of variation is expressed as a percentage that indicates the extent of variability in relation to the mean. This statistical measurement helps in comparing the degree of variation from one dataset to another, even if the means are drastically different.