Does national prevalence and correlate of walking and bicycling to school?
More than a third of youth aged 9 to 15 years live within a mile of school, but less than half of these students walk or bike to school even 1 day per week. The lowest proportions of active travelers among the independent correlates include students in the South, students living in rural areas, and students of parents with an advanced degree.
These data indicate that SHBG has no influence on the plasma distribution of E4 or its availability to target tissues. In addition, it is shown that E4 has no effect on SHBG production by human hepatocytes.