> Because physical exams are performed in mobile vans in NHANES, data could not be collected in northern latitudes during the winter
Why not?
> Because physical exams are performed in mobile vans in NHANES, data could not be collected in northern latitudes during the winter
Why not?
Probably due to road conditions during the winter season. Imagine asking someone who isn't used to driving on icy roads to drive a large van full of equipment up through the Rockies
They plow the mountain passes in the winter time in at least Montana and Idaho. I'd be very surprised if they don't in Colorado or Utah.
They do, however the roads are, potentially icy, certainly after a storm, which means that you can't measure consistently, even if you're trying because some days the roads will be impassable.
If someone's not used to driving in snow, it'll be even worse. You should not let them drive if there's snow/ice expected in the next day; or the roads haven't been cleared yet. As someone who grew up in Minnesota, I can tell you that yes, we are better at driving in snow than people down south. However, we go in the ditch a lot anyway.