Table 1.

Detailed information on outcome measures that will be obtained from the CABC^a survey and the CRN PROMs^b survey.

Outcome(s)				Assessed with		Number of items, n
CABC survey: ≥7, 13, 24, and 35 months after diagnosis
	Primary outcome (from 7 to 13 months after diagnosis)
		Perceived stress	Cohen 10-item Perceived Stress Scale [76]		10
	Secondary outcomes (all time points)
		Perceived stress	Cohen 10-item Perceived Stress Scale [76]		10
		Health and health-related quality of life	RAND Corporation 36-Item Short Form Health Survey [11]		36
		Coping	Theoretically Originated Measure of the Cognitive Activation Theory of Stress [77]		7
		Fatiguec	Chalder’s Fatigue Scale [78]		11+2d
		Awareness/mindfulness	Baer’s Mindfulness Questionnaire [49,79]		15
		Distress	Patient Health Questionnaire [80]		4
		Sleep	The Survey of Shift Work, Sleep and Health [81]		10
		Work and use of social servicese	Work, use of social services, and Ability Index [82] and single-item question [83]		3
CRN PROMs survey: ≥21 days and 14 and 36 months after diagnosis
	Secondary outcomes (all time points)
		Cancer-related quality of life	European Organization of Research and Treatment of Cancer-Core Quality of Life Questionnaire [84]		30
		Breast cancer–related quality of life	European Organization of Research and Treatment of Cancer-Core Quality of Life Questionnaire: Breast Cancer–Specific Module [85]		23
		Neuropathy/neuropathic pain, vaginal symptoms, arthralgia	Functional Assessment of Cancer Therapy: Gynecologic Oncology Group—Neurotoxicity and Endocrine Symptoms [86]		8
		Fatigue	Chalder’s Fatigue Scale [78]		11+2d
		Workability and use of social services	Work Ability Index [82] and single-item question [83]		3
		Stressf	Stress Experience Scale [87]		1
		Background questions	Educational level, living with children <18 years (yes/no), household income, living situation, income, physical activity level (light and high intensity), smoking and alcohol habits, and height and weight		11

^aCABC: Coping After Breast Cancer.

^bCRN PROMs survey: Cancer Registry of Norway patient-reported outcome measures survey.

^cChalder’s Fatigue Scale is only included at baseline and at month 24 by the CABC survey because it is assessed with the CRN PROMs survey at 13 and 36 months after diagnosis.

^dThe survey sent to participants diagnosed in 2020 included the 11-item Chalder’s Fatigue Scale, whereas questions on duration and extent of fatigue symptoms [88,89] were added to the survey sent to participants enrolled and followed up after 2021.

^eOnly included at 24 months of follow-up in the CABC survey.

^fStress assessed as 1 item is not defined as a secondary outcome but can be used in exploratory analysis.