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.
Mean depression over time by condition. PHQ-9: Patient Health Questionnaire–9 Note. Vertical lines represent error bars (with a 95% confidence interval); non-overlapping error bars indicate that the true means are likely to be different from each other.
