Originally Posted by blackcat
Wikipedia tends to be my "go-to" place for trying to find unbiased info, and it says that the proportion of children meeting the criteria drops by half in the 3 years following diagnosis. So I would guess they either never had it in the first place, or they grew out of it (brain maturity or whatever).

"Growing out of it" may be the wrong term. It's possible that they just grew up a bit. Kids develop at different rates.