Could be but this study correlates with many other studies, some of which have factual data. e.g. things like teenage pregnancies are well-studied and can be ob

Could be but this study correlates with many other studies, some of which have factual data. e.g. things like teenage pregnancies are well-studied and can be observed without relying on self-reported data, and they indeed have gotten much better. Smoking is another one which has gotten much better. On the whole it seems quite reliable, although some stats are not very meaningfuk. e.g. watching TV is a bit of a silly stat if you ask me, kids have just moved from traditional TV but they're probably 'wasting' as much time on media entertainment as before through other channels.