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Table 2 Distribution and relative influence of significant variables

From: Prospective prediction of PTSD diagnosis in a nationally representative sample using machine learning

  Risk Factors No PTSD Diagnosis
(n = 31,868)
PTSD Diagnosis
(n = 2785)
Chi-square Value Relative Influence a
n % n %   
DSM-IV Diagnosis Major depressive episode, lifetime 6287 19.73 1653 59.35 2274.6* 10.38
Major depressive episode, since last interview 2513 7.89 1060 38.06 2518.5* 17.29
Major depressive episode, since last interview, before past year 1728 5.42 766 27.50 1866.5* 0.19
Manic episode, since last interview 519 1.63 343 12.32 1201.6* 0.19
Mood disorder total       28.05
Generalized anxiety disorder, lifetime 1897 5.95 833 29.91 2022.2* 1.97
Generalized anxiety disorder, since last interview 966 3.03 584 20.97 1924.6* 1.40
Generalized anxiety disorder, past year 844 2.65 519 18.64 1728.2* 0.08
Panic disorder with Agoraphobia, since last interview 156 0.49 191 6.86 1041.5* 0.09
Social Phobia, since last interview 698 2.19 371 13.32 1057.7* 0.07
Specific phobia, since last interview 2237 7.02 739 26.54 1240* 1.01
Specific phobia, past year 2069 6.49 689 24.74 1161.6* 0.38
Anxiety disorder total       5.0
Schizotypal Personality Disorder, Lifetime 984 3.09 550 19.75 1676.5* 0.41
Borderline personality disorder, lifetime 1409 4.42 822 29.52 2673.3* 47.92
Personality disorder total       48.33
Trauma Exposure Ever stalked by anyone 1523 4.78 579 20.79 1138.2* 0.11
Other than terrorist attack, ever have someone close to you die unexpectedly 12,413 38.95 1766 63.41 618.83* 0.07
Ever sexually assaulted, molested, raped, or experienced unwanted sex 2387 7.49 941 33.79 2017.3* 17.61
Physically attacked/beaten/injured before age 18 by parent/caretaker 913 2.86 407 14.61 952.95* 0.09
Seriously neglected before age 18 by parent/caretaker 818 2.57 377 13.54 914.18* 0.08
Ever physically attacked/beaten/injured by spouse or romantic partner 1864 5.85 709 25.46 1414.6* 0.66
  Traumatic exposure total       18.62
  1. * p < 0.0001, ** p < 0.001
  2. a Relative influence is reported as percent influence