sentences:  Comparatively, fewer controlled experimental studies of intergroup contact exist; of those that do, few measure prejudice outcomes longer than one day after treatment, leaving a gap in the literature that investigates the long-term effects of contact.Furthermore, of these experiments, none measure the reduction of racial prejudice in people over the age of 25.Similarly, in a report to the United Kingdom Equality and Human Rights Commission, Dominic Abrams highlights "a
  dearth of good-quality longitudinal research on prejudice or prejudice reduction”.