Negative stereotypes of Gen X young adults continued, including that they were "bleak, cynical, and disaffected". In 1998, such stereotypes prompted sociological research at Stanford University to study the accuracy of the characterization of Gen X young adults as cynical and disaffected. Using the national General Social Survey, the researchers compared answers to identical survey questions asked of 18–29-year-olds in three different time periods. Additionally, they compared how older adults answered the same survey questions over time. The surveys showed 18–29-year-old Gen Xers did exhibit higher levels of cynicism and disaffection than previous cohorts of 18–29-year-olds surveyed. However, they also found that cynicism and disaffection had increased among all age groups surveyed over time, not just young adults, making this a period effect, not a cohort effect. In other words, adults of all ages were more cynical and disaffected in the 1990s, not just Generation X.