Table 1.

Classification task and observed positive and negative events for each outcome. The term “positive events” refers to the outcome-of-interest, i.e., to those participants in the sample who are on an “increasing” PTSD symptom trajectory or who meet the cutoff for provisional PTSD diagnosis (PCL-5 score ≥31). “Negative events” are those participants who are on a “resilient” trajectory or who do not meet the cutoff. Depicted are the sample size for each outcome for the training set, the test set and the total sample.

Classification task	Training set (75%)	Test set (25%)	Total (N = 473)
PTSD symptom trajectories
“Increasing”	n = 33	n = 10	n = 43
“Resilient”	n = 323	n = 107	n = 430
PCL-5 cutoff score
Provisional PTSD	n = 27	n = 9	n = 36
No PTSD	n = 328	n = 109	n = 437