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.
Multivariate, mixed-effect logistic regression model of previous prevalence of head lice among households with school as a random-effect variable and grade of oldest elementary school child in the household included as a predictor variable
(Odds ratios are in relation to the first category of each variable. N=4016.)
