Case example of nomogram. Note: John Doe’s parents bring him to the clinic because they are concerned about his academic performance. The scheduler noted that they are concerned about his inattentiveness and that he is forgetting to complete his homework. He is a 16-year-old male. Your clinic sent a packet with the Child Behavior Checklist (CBCL), Youth Self Report (YSR), and Teacher Report Form (TRF) to be completed prior to his intake visit. Your clinic has a local prevalence rate (i.e., base rate) of 50%. On the Attention Problems subscale, his mother’s rating resulted in a T-score of 75, his teacher’s in a T-score of 68, and John’s in a T-score of 65. Black ovals indicate positions on the nomogram, and gray ovals indicate prior steps. The combined results move the initial probability of 50% to a posterior probability of 77%. Note that the TRF and YSR scores correspond with only moderate elevations compared to norms and to clinical samples. ADHD = attention-deficit/hyperactivity disorder; DLR = diagnostic likelihood ratios.