Table:
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)

Express the illustration as Markdown code.

| 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) |