Table 3.

Study Timeline and Assessment Schedule

	Base- line	Three Good Things Intervention (TGT) or Placebo (P) Administration over 14 Days														Follow- Up	Follow- Up
Week								1							2	8	14
Day		1	2	3	4	5	6	7	8	9	10	11	12	13	14	56	98
Intervention	O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	TGT O	O	O
Control	O	P O	P O	P O	P O	P O	P O	P O	P O	P O	P O	P O	P O	P O	P O	O
Quantitative
GQ-6	G							G							G	G
PANAS-NA		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
PANAS-UPA		UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA	UPA
PANAS-APA		APA	APA	APA	APA	APA	APA	APA	APA	APA	APA	APA	APA	APA	APA	APA
Qualitative															Open- ended survey questions		In- depth inter- views

Notes. O=Observation (an assessment/measurement occasion). TGT=Three good things intervention. P=Placebo exercise. G=administration of the Gratitude Questionnaire-Six Item Form (GQ-6). NA=administration of the Positive and Negative Affect Schedule-Expanded Form, Negative Affect Subscale (PANAS-NA). UPA=administration of the PANAS-Expanded Form, Serenity Subscale (Unactivated Positive Affect). APA=administration of the PANAS-Expanded Form, Positive Affect Subscale (Activated Positive Affect).