Incidence and risk factors of post-traumatic stress disorder in patients after endoscopic submucosal dissection for early gastric cancer

Table 2 Comparison of psychological assessment indicators between post-traumatic stress disorder group and non-post-traumatic stress disorder group (mean ± SD, points)

Scale	Time point	PTSD group (n = 56)	Non-PTSD group (n = 160)	t value	P value
SAS	Preoperative	48.6 ± 8.2	42.3 ± 7.5	5.198	< 0.001
	3 months postoperative	51.2 ± 9.4	38.5 ± 6.8	10.632	< 0.001
SDS	Preoperative	52.3 ± 9.6	45.8 ± 8.2	4.751	< 0.001
	3 months postoperative	56.8 ± 10.5	40.2 ± 7.3	12.486	< 0.001
SSRS	Preoperative	32.4 ± 5.8	38.6 ± 6.2	-6.563	< 0.001
	3 months postoperative	28.7 ± 6.3	40.1 ± 5.9	-11.982	< 0.001

PTSD: Post-traumatic stress disorder; SAS: Self-Rating Anxiety Scale; SDS: Self-Rating Depression Scale; SSRS: Social Support Rating Scale.