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.
Profiles of observed and adjusted prevalence of permanent childhood hearing impairment with age and by degree of impairment (all: >40 dB HL; moderate: 41-70 dB HL; severe: 71-95 dB HL; profound: >95 dB HL).22 Points plotted as filled circles were excluded from some analyses. 95% confidence intervals included where they exceed width of plotting symbol. Continuous lines are best fitting sigmoidal functions
