Mean and standard deviation (SD) of subjects' age, body mass index (BMI) and height, as well as aqueductal stroke volume [101] and average flow rate [11], (1).

The average (avg) spinal CSF and systolic (syst) arterial flows used to normalize the data are listed. Significant differences and correlations are summarized below.
Difference between female and male volunteers:
*P = 0.033;
**P = 0.028.
Correlation in entire population of height with age  = 0.44, P = 0.04; and sex  = 0.75, P0.0001.
Correlation of height with sex in young group  = 0.87, P = 0.0006; and in elderly group  = 0.70, P = 0.017.