Race and age play a factor in the increased risk. The highest ratios for males are attributed to young Caucasians. By the age of 25, their risk is more than halved; however, the risk for black gay males at that age steadily increases to 8.6 times more likely. Over a lifetime, the increased likelihoods are 5.7 times for white and 12.8 for black gay and bisexual males. Lesbian and bisexual females have the opposite trend, with fewer attempts during the teenager years compared to heterosexual females. Through a lifetime, the likelihood for Caucasian females is nearly triple that of their heterosexual counterparts; however, for black females there is minimal change (less than 0.1 to 0.3 difference), with heterosexual black females having a slightly higher risk throughout most of the age-based study.