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Table 1 The application of the two-stage window screening method for screening of children using the Parental Concern Checklist (PCC) at 18 months and the rate of diagnosis with autism spectrum disorder (ASD) at 5.5 years old

From: Two-stage window screening and development trajectories in early identification of autism spectrum disorder among Han Chinese children

  ASD Not diagnosed Total  
PCC 3–6 25 2615 2640 PPV:
25/2640 = 0.95%
Others 63 18,960 19,023 NPV:
18,960/19,023 = 99.67%
Total 88 21,575 21,663  
  Sensitivity
25/88 = 28.41%
Specificity
18,960/21,575 = 87.87%
  
  1. PPV positive predictive value, NPV negative predictive value