Table 3.

Summary of primary and secondary outcome measures

Measures	Items and assessed construct
Clinician measures
Oncologist and nurse self-efficacy in triadic communication	13-item perceived self-efficacy in triadic communication scale based on Parle et al.51
Preferences for involvement of the caregiver in communication/decision-making	2 questions developed by Shin et al44 assessing clinician preferences of caregiver involvement in treatment decision-making
Practical strategies/policies for including caregivers	12-item purpose-built questionnaire assessing how clinicians welcome and manage caregivers in their own workplace
Knowledge of strategies	14 purpose-designed situational vignette items assessing clinician knowledge/application of strategies to manage caregiver involvement.
Usability	2-item UMUX-LITE.52 Assesses overall usability (ease of use and system capability) of module.
Satisfaction with the module/website	11-item purpose designed questionnaire assessing participant satisfaction with features of eTRIO or NSW Health websites.
Caregiver measures
Caregiver self-efficacy in interactions with their oncologist or nurse	14-item perceived self-efficacy in triadic consultation communication adapted from PEPPI-1043 with seven additional items.
Caregiver satisfaction with communication with their oncologist and nurse	25-item purpose-designed Consultation Satisfaction Scale adapted from.45 Assesses caregiver satisfaction with clinician communication.
Health literacy	4 item health literacy measure.53
Preferences for involvement of the caregiver in communication/decision-making	2-item scale44 assessing caregiver preferences for involvement.
Caregiver distress	21-item Depression, Anxiety and Stress Scale (DASS-21).46
Preparedness for caregiving	8-item Preparedness for Caregiving Scale.47
Patient-caregiver communication	2 subscales of the Health Literacy of Caregiver Scale—Cancer.48 Assesses cancer related patient–caregiver communication and needs and preferences.
Quality of life (health utility)	12-item quality of life measure assessment of quality of life (AQoL)-4D.49
Healthcare expenditure	Purpose designed incurred cost questionnaire. Assesses patient general practitioner (GP)/specialist visits, hospital stays, counselling and other support services.
Caregiver time	2-item scale. Valued using the market price of labour (ie, wages or the aged pension).
Caring experience	The Carer Experience Scale.50
Usability	2-item UMUX-LITE.52 Assesses overall usability (ease of use and system capability) of module.
Satisfaction with the module/website	11-item purpose designed questionnaire assessing participant satisfaction with features of eTRIO or NSW Health websites.
Patient measures
Patient self-efficacy in interactions with their oncologist or nurse	11-item perceived self-efficacy triadic consultation communication adapted from PEPPI-1043 with four additional items. Assesses patient self-efficacy in triadic communication with their clinician and caregiver.
Patient satisfaction with communication with their oncologist and nurse	25-item purpose-designed Consultation Satisfaction Scale, adapted from.45 Assesses patient’s satisfaction with communication with their clinician.
Health literacy	4 item health literacy measure.53
Preferences for involvement of the caregiver in communication/ decision-making	2 questions developed by Shin et al.44 Assesses patient preferences of caregiver involvement in treatment decision-making.
Patient distress	21-item DASS-21.46
Quality of life (health utility)	12-item quality of life measure AQoL-4D.49
Healthcare expenditure	8-item purpose designed incurred cost questionnaire. Assesses patient GP/specialist visits, hospital stays, counselling and other support services.
Usability	2-item UMUX-LITE.52 Assesses overall usability (ease of use and system capability) of module.
Satisfaction with the module/website	11-item purpose designed questionnaire assessing participant satisfaction with features of eTRIO or NSW Health websites.