Risk factors for post-traumatic stress disorder among young and middle-aged cancer patients in the intensive care unit: A case-control study

Table 2 Value assignment for factors potentially related to post-traumatic stress disorder

Factors	Variables	Assignment methods
Occurrence of PTSD	Y	PTSD-negative = 0, PTSD-positive = 1
Gender	X1	Male = 0, Female = 1
Monthly income,	X2	≤ 3000 = 0, 3000 – 6000 = 1, > 6000 = 2
Use of analgesics	X3	No = 0, Yes = 1
Physical restraint	X4	No =0, Yes= 1
APACHE II score	X5	Actual measurement value
Family burden	X6	No = 0, Yes = 1
Planned transfers	X7	No = 0, Yes = 1
Tracheal intubation	X8	No = 0, Yes = 1
Length of ICU stay	X9	Actual measurement value

APACHE II: Acute Physiology and Chronic Health Evaluation; ICU: Intensive care unit; PTSD: Post-traumatic stress disorder.