4 ms·
The study lead was interviewed on R4 this morning, and asserted they they'd controlled for this.
by timthorn 10y ago
The study lead was interviewed on R4 this morning, and asserted they they'd controlled for this.
- redcalx 10y agoThanks. Seems they were acutely aware of this; it's the first thing discussed in the paper: http://jech.bmj.com/content/early/2016/10/05/jech-2016-207898.full.pdf+html http://jech.bmj.com/content/early/2016/10/05/jech-2016-20789... They're comparing with people who went to other groups, and concluding that there is a quality of scouts and guides in particular that is protective. I do wonder if there is still selection bias, since you may choose to avoid certain types of group, and attend others.