To find the coefficient of variation (CV) for each data set, we'll follow these steps:

1. Calculate the mean (average) of each data set.
2. Calculate the standard deviation (SD) of each data set.
3. Compute the coefficient of variation for each data set using the formula: $CV = \left( \frac{\text{Standard Deviation}}{\text{Mean}} \right) \times 100$
4. Compare the coefficients of variation to determine which group shows more variation in systolic blood pressure relative to its mean.

Please provide the systolic blood pressure data for both groups (men aged 20-29 and men aged 60-69), and I'll proceed with the calculations.