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.<p>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&#x27;re probably &#x27;wasting&#x27; as much time on media entertainment as before through other channels.