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

Table 2 Healthcare resource utilization (PPP6M)

	Actual Positive PTSD cohort	Likely PTSD cohort	Without PTSD cohort
	N = 44,342	N = 5683	N = 2,074,471
Inpatient admissions, mean ± SD [median]	0.2 ± 0.6 [0.0]	0.3 ± 0.7 [0.0]	0.0 ± 0.2 [0.0]
≥ 1 admission, N (%)	5305 (12.0%)	1278 (22.5%)	54,748 (2.6%)
Inpatient days, mean ± SD [median]	1.4 ± 6.2 [0.0]	2.4 ± 6.8 [0.0]	0.1 ± 1.5 [0.0]
Days with emergency room services, mean ± SD [median]	0.6 ± 1.6 [0.0]	0.7 ± 1.6 [0.0]	0.2 ± 0.7 [0.0]
Days with outpatient services, mean ± SD [median]	18.3 ± 14.2 [15.0]	13.3 ± 13.5 [10.0]	4.1 ± 6.4 [2.0]

N Number, PPP6M Per patient per 6 months, PTSD Post-traumatic stress disorder, SD Standard deviation

ISSN: 1471-244X