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Table 1 Demographic and clinical characteristics

From: Identifying individuals with undiagnosed post-traumatic stress disorder in a large United States civilian population – a machine learning approach

Number of patients

Actual Positive PTSD cohort

Likely PTSD cohort

Without PTSD cohort

N = 44,342

N = 5683

N = 2,074,471

Demographic characteristics

Age, years; mean ± SD [median]

38.7 ± 13.0 [38.0]

38.2 ± 12.6 [38.0]

42.5 ± 13.1 [44.0]

Female, N (%)

32,579

(73.5%)

3946

(69.4%)

1,464,405

(70.6%)

Heath plan type, N (%)

 Preferred provider organization plan

25,916

(58.4%)

3462

(60.9%)

1,203,878

(58.0%)

 Health maintenance organization plan

5538

(12.5%)

656

(11.5%)

237,455

(11.4%)

 Consumer-driven health plan

4463

(10.1%)

492

(8.7%)

193,161

(9.3%)

 Non-capitated point-of-service plan

3229

(7.3%)

459

(8.1%)

180,090

(8.7%)

 High deductible health plan

3003

(6.8%)

431

(7.6%)

184,075

(8.9%)

 Comprehensive plan

1482

(3.3%)

99

(1.7%)

39,544

(1.9%)

 Exclusive provider organization plan

315

(0.7%)

31

(0.5%)

15,225

(0.7%)

 Capitated or partially capitated point-of-service plan

157

(0.4%)

19

(0.3%)

8399

(0.4%)

 Unknown

239

(0.5%)

34

(0.6%)

12,644

(0.6%)

Census region of residence, N (%)

 South

16,210

(36.6%)

2284

(40.2%)

880,418

(42.4%)

 Midwest/North Central

10,022

(22.6%)

1278

(22.5%)

420,312

(20.3%)

 West

9151

(20.6%)

1232

(21.7%)

404,749

(19.5%)

 Northeast

8872

(20.0%)

885

(15.6%)

367,195

(17.7%)

 Unknown

87

(0.2%)

4

(0.1%)

1797

(0.1%)

Clinical characteristics

CCI scorea, mean ± SD [median]

0.3 ± 0.8 [0.0]

0.2 ± 0.6 [0.0]

0.2 ± 0.6 [0.0]

Most frequent diagnosesb, N (%)

 General contact with health services

29,450

(66.4%)

3777

(66.5%)

1,100,899

(53.1%)

 Musculoskeletal and connective tissue diseases

19,420

(43.8%)

2480

(43.6%)

552,880

(26.7%)

 General symptoms and abnormal findings

18,758

(42.3%)

2434

(42.8%)

566,973

(27.3%)

 Endocrine, nutritional, and metabolic diseases

16,256

(36.7%)

2075

(36.5%)

565,530

(27.3%)

 Respiratory diseases

14,361

(32.4%)

1642

(28.9%)

435,604

(21.0%)

 Genitourinary diseases

12,162

(27.4%)

1445

(25.4%)

369,407

(17.8%)

 Digestive system diseases

9500

(21.4%)

1181

(20.8%)

250,069

(12.1%)

 Skin and subcutaneous tissue diseases

8980

(20.3%)

864

(15.2%)

306,338

(14.8%)

 Injury

8817

(19.9%)

1148

(20.2%)

195,100

(9.4%)

 Nervous system diseases

7553

(17.0%)

924

(16.3%)

130,672

(6.3%)

  1. CCI Charlson Comorbidity Index, ICD-10-CM International Classification of Diseases, Tenth Revision, Clinical Modification, N Number, PTSD Post-traumatic stress disorder, SD Standard deviation
  2. aSource: Quan, H., Li, B., Couris, C. H., Fushimi, K., Graham, P., Hider, P., Januel, J. M., & Sundararajan, V. (2011). Updating and validating the Charlson Comorbidity Index and score for risk adjustment in hospital discharge abstracts using data from 6 countries. American Journal of Epidemiology, 173(6), 676–682
  3. bDiagnoses were defined based on three-digit ICD-10-CM code categories. Diagnoses that may indicate a symptom or complication potentially related to PTSD have been excluded from this list and are reported in Fig. 2