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.
Fitted interaction plot showing the magnitude of change in sleep problems (PSQI global score) by race and socioeconomic status (SES). Values are derived from Model 3 with non-significant interaction effects removed. Error bars reflect 95% confidence intervals. Low SES is defined as 1 SD below the mean, equivalent to a score of 2.4 on the 0 to 4 scale. High SES is defined as .73 SD units above the mean, equivalent to a score of 4 (highest possible value).
