Abstract To facilitate early identification and intervention, increasing attention has focused on screening young people for early sub-threshold psychosis symptoms. Several promising self-report tools employ clinically derived cut-offs or criteria show reasonable predictive validity for persistence or worsening of psychosis symptoms. However, utility for individualized screening in the community is limited by evidence that item responses and total scores are influenced by demographic characteristics, particularly in younger children and adolescents who tend to endorse more symptoms than older youths. To inform interpretation of individual responses in research, clinical and community settings, we aimed to develop age, sex and race normative references for a widely used psychosis risk screening measure. Community youths ( = 7053) between the ages of 11–21 participating in the Philadelphia Neurodevelopmental Cohort (Calkins et al. 2014, 2015) were administered a computerized version of the 12-item PRIME-Screen-Revised (PS-R, Kobayashi et al., 2008) to assess sub-psychotic symptoms (Miller et al. 2004). Items were self-rated on a 7-point scale ranging from 0 (Definitely Disagree) to 6 (Definitely Agree). We first evaluated age, sex and race differences in total scores and individual item responses. We next calculated z-scores based on means and SDs within each age year (11 to 21) for the total sample, males, females, European-American and non-European American groups. Finally, standard () score tables were generated for each reference group, where = 50 + 10(z). PS-R total scores were significantly lower in older than younger individuals across the age range (eg, age 11 mean score = 10.7, SD = 12.5; age 21 mean score = 5.5, SD = 8.4; all s < .05). The youngest (age 11) and oldest males (ages 18–21) had higher total scores than females of the same age (s < .05). European-Americans had lower total scores than non-European Americans in all age bins (s < .001). Particular individual item responses also showed age, sex and race differences. Sample sizes across age bins ranged from = 187 to 848. To our knowledge, this is the first effort to provide normative, standardized reference scores for a psychosis spectrum screening tool. Our results underscore the need to interpret endorsements of community youths in the context of age, sex and race. The standard score tables developed here can facilitate assessment of the “normalcy” of individual responses according to these demographic parameters. Public availability of these normative data for use by clinicians and researchers in an online interface using Research Electronic Data Capture (REDCap) should expedite and improve early identification of youths at risk for psychosis.