Scale

Cronbach’s alpha coefficient

Item-total correlation

Alpha if item deleted

DHSMS scale

0.915

0.444 - 0.610

0.910 - 0.913

Skill to form partnership with other important people

0.864

0.558 - 0.674

0.841 - 0.855

Skill to prevent or cope with

post-gastrectomy disorder

0.855

0.509 - 0.709

0.823 - 0.851

Skill to grasp issues accompanying post-gastrectomy disorder

0.856

0.513 - 0.662

0.831 - 0.841

Self-efficacy

0.828

0.565 - 0.722

0.751 - 0.821