The data comes from recent analysis of survey data from over 80,000 students across 24 states in grades five through twelve. (youthtruthsurvey.org)
Most of the studies are based on survey data on large numbers of people of all different relationship categories; there is typically not a group breakdown. (drbarbarawinter.com)
The most recent survey data showed increased risk of hearing loss among participants of racial / ethnic minority status and from lower socioeconomic backgrounds. (sciencedaily.com)