Roughly 1 in 4 lesbian or gay teens and 15 percent of bisexual teens are homeless, versus 3 percent of exclusively heterosexual teens, finds a Children's Hospital Boston study of more than 6,300 Massachusetts public high school students. Moreover, among teens who were homeless, those who were gay, lesbian or bisexual (GLB) were consistently more likely than heterosexuals to be on their own, unaccompanied by a parent or guardian.

The study, published online July 21 by the American Journal of Public Health, is the first to quantify the risk of homelessness among teens of different sexual orientations with population-based data. "Prior studies in homeless street youth have found that sexual minorities occur in much higher numbers than we'd expect based on their numbers in the community in general," says Heather Corliss, PhD, MPH, of the Division of Adolescent and Young Adult Medicine at Children's, the study's first author. "This study looked at the magnitude of the difference for the first time."

Corliss and colleagues analyzed data from the 2005 and 2007 Massachusetts Youth Risk Behavior Surveys (YRBS). The YRBS, conducted every other year in most U.S. states, draws a representative sample of students in grades 9 through 12. In 2005, Massachusetts was the first state to add a multiple-choice question assessing homeless status, asking "What is your primary nighttime residence?" or "Where do you typically sleep at night?" Homelessness was defined as lacking a fixed, regular and adequate nighttime residence, as per the McKinney-Vento Homelessness Assistance Act, the primary federal legislation dealing with the education of homeless children and youth in U.S. public schools.

The initial sample of 6,653 students was narrowed to 6,317 who gave full information on their sexual orientation and homelessness status. Less than 5 percent of students overall identified themselves as GLB, yet they accounted for 19 percent of those who identified themselves as homeless.

Rates of homelessness were 3.2 percent among exclusively heterosexual students, 12.5 percent among heterosexuals reporting same-sex partners, 15 percent among bisexuals, 25 percent among lesbian/gay students, and 20 percent among students who said they were unsure of their sexual orientation.

Among the youth who were homeless, those who were not exclusively heterosexual were more likely to be living away from their families. Among boys identifying as gay, 15 percent were homeless but unaccompanied by parents/guardians, and 8 percent were homeless but living with parents. Among lesbian girls, 22.5 percent were homeless and unaccompanied, while just 3.8 percent were homeless but with their parents. The same pattern held among bisexual students, among heterosexuals with same-sex partners, and among males unsure of their sexual orientation.

"Teens with a sexual minority orientation are more likely than heterosexual teens to be unaccompanied and homeless rather than part of a homeless family," says Corliss. "This suggests that they may be more likely to be mistreated or rejected by their families and more likely to leave home."

The researchers hope their findings will raise awareness of the vulnerability of GLB youth to homelessness, particularly among school administrators and other professionals working with adolescents. Homeless people are well documented as being at increased risk for victimization, physical and sexual abuse, mental health problems, substance use problems and sexual risk behaviors. These risks are even greater for teens who lack their families' supervision and support.

"The high risk of homelessness among sexual minority teens is a serious problem requiring immediate attention," says Corliss. "These teens face enormous risks and all types of obstacles to succeeding in school and are in need of a great deal of assistance."

The study has limitations in being done only in Massachusetts, where attitudes toward homosexuality tend to be more favorable, so it possibly underestimates the proportion of GLB youth that are homeless nationally. It also included only students who were at school on the day the survey was administered, so may have missed more homeless youths, who are more likely to be absent from school. Finally, because it was based on the YRBS, it wasn't able to assess family relationships or whether teens were "out" about their sexuality.