Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Johnson-Neyman Plot outlining the change in slope between time and teen-reported top problem severity at increasing levels of IQ (solid red line) and confidence intervals (dotted lines). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
