Figures 2a-2d. Decision curves for all unweighted stepwise 4-item short-form scales predicting PTSD outcomes in the total validation sample (n = 11,728).
The items included on each 4-item scale were optimized in the training sample to predict dichotomous PTSD outcomes assigned based on full PCL-5 responses using four diagnostic thresholds (DSM-5 Criteria B-E, and total PCL-5 scores >= 28, >=32, and >=38). We then used each of these 4-item unweighted stepwise short-form scales to predict these same dichotomous PTSD outcomes in the validation sample, as shown in each panel of the figure (a-d).
