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.
Canal visibility (%) by age and location, with 95% confidence interval. Significant visibility differences were found: female < male, PM1, age 47–56 < PM1 age 65+, M2 age 65+ < PM1 age 65 + and PM2 age 65+, (p = 0.0180); female PM1 < female M1 and female M2. M1, first molar; M2, second molar; PM1, first premolar; PM2, second premolar.
