3 ms·
No, this is also found in children. See e.g. this[1] study, which also by design (it's a twin study) rules out the hypothesis that the effect is mostly environm
by xyzzyz 7y ago
No, this is also found in children. See e.g. this[1] study, which also by design (it's a twin study) rules out the hypothesis that the effect is mostly environmental.
[1] - https://www.ncbi.nlm.nih.gov/pubmed/17081263 https://www.ncbi.nlm.nih.gov/pubmed/17081263
- iguy 7y agoThanks. That there is signal in which twin is taller at precisely age 12 is interesting, and seems like the same phenomenon as the adult effects. But I'm saying something much simpler. In a school class, there's another effect, that the oldest may be a year or more older than the youngest. The mix of ages in a classroom will produce a correlation all by itself. It seems to me this would be a much bigger effect: 7th-graders are quite a bit taller, and better on tests, than 6th-graders.
- xyzzyz 7y agoAh, that's a good point. It would probably require looking deeper into the studies to see how it is controlled for, if at all.