concluded that female youth were more likely to report consistent sexual identities than males. The study was conducted over a single year. Youth appears to be when most change in sexual orientation identity occurs for females. A 10-year study compared sexual orientation as measured at four times during the study. The most change was found between the first (taken at 18 years of age) and second (taken at 20 years of age) measurements which was the only time bracket that fell during adolescence. A population-based study conducted over 6 years found that nonheterosexual (gay/lesbian/bisexual) male and female participants were more likely to change sexual orientation identity than heterosexual participants. A yearlong study found that sexual identity was more stable for gay and lesbian youth participants when compared to bisexual participants. The identity integration process that individuals go through during adolescence appears to be associated with changes in sexual identity; adolescents who score higher on identity integration measures are more consistent in their sexual orientation. Bisexual youths seem to take longer to form their sexual identities than do consistently homosexual or heterosexual identifying youths so bisexuality may be seen as a transitional phase during adolescence. Rosario et al. (2006) conclude that "acceptance, commitment, and integration of a gay/lesbian identity is an ongoing developmental process that, for many youths, may extend through adolescence and beyond." Sabra L. Katz-Wise and Janet S. Hide report in article published 2014 in "Archives of Sexual Behavior" of their study on 188 female and male young adults in the United States with a same-gender orientation, aged 18–26 years. In that cohort, sexual fluidity in attractions was reported by 63% of females and 50% of males, with 48% of those females and 34% of those males reporting fluidity in sexual orientation identity. Bisexuality as a transitional phase Bisexuality as a transitional phase on the way to identifying as exclusively lesbian or gay has also been studied. In a large-scale, longitudinal study, participants who identified as bisexual at one point in time were especially likely to change sexual orientation identity throughout the six-year study. A second longitudinal study found conflicting results. If bisexuality is a transitional phase, as people grow older the number identifying as bisexual should decline. Over the 10-year span of this study (using a female-only sample), the overall number of individuals identifying as bisexual remained relatively constant (hovering between 50 and 60%), suggesting that bisexuality is