Table 1.

Demographic and clinical characteristics of patients studied

Characteristic	All studied patients	'High-scoring patients'	'Low-scoring patients'
Risk for development of PTSD, n (percentage)	65	18 (29%)	44 (71%)
PTSD score (mean ± SD)	28.1 ± 13.9	46.3 ± 8.9	20.6 ± 7.1a
Age, years (mean ± SD)	39 ± 15	41 ± 13	39 ± 15
Sex, n (male/female)	35/30	8/10	25/19
Period between discharge and study, months (mean ± SD)	57 ± 32	56 ± 33	59 ± 31
Lung Injury Score (mean ± SD)	3.2 ± 0.5	3.3 ± 0.5	3.2 ± 0.5
APACHE II score (mean ± SD)	16 ± 6	15 ± 4	16 ± 6
ICU length of stay, days (mean ± SD)	47 ± 32	59 ± 37.0	42 ± 29b
Duration of mechanical ventilation, days (mean ± SD)	30 ± 22	37 ± 22	27 ± 22
Cause of ARDS, n (percentage within group)
Sepsis	13 (20)	5 (28)	8 (18)
Pneumonia	28 (43)	7 (39)	20 (45.5)
Multiple trauma	20 (31)	5 (28)	14 (32)
Other	4 (6)	1 (6)	2 (4,5)
ECMO, n (percentage within group)	7 (11)	3 (17)	4 (9)
Current status of employment, n (percentage within group)
Work/training	29 (46)	7 (39)	22 (50)
Unemployed/working at home	5 (8)	1 (5.5)	4 (9)
Retired	7 (10)	1 (5.5)	6 (14)
Disabled	12 (18)	8 (44)	4 (9)b
Others	6 (13)	1 (5.5)	5 (11)
No data	3 (5)	-	3 (7)

In 2 patients (3%) there were no data for PTSD. PTSD, post-traumatic stress disorder; SD, standard deviation of the mean; 'high-scoring patients', patients with a Post-Traumatic Stress Syndrome 10-Questions Inventory (PTSS-10) score greater than or equal to the cutoff score of 35 points, indicating an increased risk of development of PTSD; 'low-scoring patients', patients with a PTSS-10 score below the cutoff score; APACHE, Acute Physiology and Chronic Health Evaluation; ICU, intensive care unit; ARDS, acute respiratory distress syndrome; ECMO, extracorporeal membrane oxygenation. Significance was assumed at a two-tailed p < 0.05. ^aSignificant difference; ^btrend.