Analysis 1.4.
Comparison 1 Perceptual intervention versus control, Outcome 4 Perceptual impairment at scheduled end of intervention.
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.