Table 1.

Positive psychological intervention program of PERMA model.

Times of intervention	Theme of intervention	Concrete measures
The first time	Positive self-cognition	Patiently answered patients' doubts, established a good nurse-patient relationship, encouraged patients to tell their own thoughts, understood the true thoughts of patients and collected data; made use of positive cases to make patients face the disease positively, increased patients' confidence in disease treatment, and explained the basic knowledge of chemotherapy to patients to correct their misunderstandings.
The second time	Introduction of positive emotions	Introduced positive psychology, guided patients to look at the current situation of the disease with a positive perspective, made patients aware of the benefits of positive cognition to the disease; guided patients to recall events of gratitude, asked patients to speak up on positive events and encouraged patients to use more positive words to raise their own positive emotions.
The third time	establishing positive emotions	Asked patients to pay attention to adverse events, list their own adverse emotional events and thoughts after the events, find evidence to refute pessimistic thoughts and make optimistic explanations. Praise and support should be given in time when the patient showed positive emotions
The fourth time	Input	Designed activities for patients according to their interests, such as square dancing, flower cultivation, walking, listening to soothing music, Taijiquan, Five-Animal Exercise, yoga and other measures to disperse the pain caused by chemotherapy and encouraged them to cultivate their interests and hobbies.
The fifth time	Interpersonal relationship	Interviewed patients' interpersonal relationships, introduced communication skills, established positive interpersonal relationships; guided patients to practice positive responses and express gratitude to those who had helped or contributed to him/her.
The sixth time	Meaning	Interviewed patients' understanding of the meaning of life and guided them to maintain an optimistic attitude to face adversity when the side effects of chemotherapy occurred.
The seventh time	Goals and achievements	Interviewed patients about their achievements and goals to make patients do what they were good at to achieve a sense of achievement; set exercise goals according to their condition and ability, and gave patients support and encouragement.