Table 3

List of all measures collected in the SocialBit Study, including measures for exposures, outcomes and covariates

Construct	Measure	Participant	T1 at intake	T2 at 3 months
Exposures
Social Interaction time—SocialBit	Interaction detected by SocialBit application	Patient	X
Social interaction time—ground truth coded	Ground truth data collected by study staff	Patient	X
Outcomes
Social isolation (objective)	Personal Network Survey for Clinical Research (PERSNET)	Patient and caregiver	X	X
Social isolation (subjective)	UCLA Loneliness Scale	Patient and caregiver	X	X
Disability	Modified Rankin Scale	Patient and caregiver	X	X
Physical function (subjective)	NIH Patient-Reported Outcome Measurement Information System (PROMIS), Physical Function	Patient and caregiver	X	X
Depression	Centre for Epidemiological Studies Depression (CES-D)	Patient and caregiver	X	X
Life satisfaction	Satisfaction with Life Scale	Patient and caregiver	X	X
Cognition	Montreal Cognitive Assessment	Patient	X	X
Stroke severity	National Institutes of Health Stroke Scale (NIHSS)	Patient	X	X
Delirium	Confusion assessment method	Patient	X	X
Caregiver burden	Caregiver Burden Scale	Caregiver		X
Covariates
Demographics	Demographics	Patient and caregiver	X
Comorbidities	Charlson Comorbidity Index	Patient	X
Lesion characteristics	Medical record, neuroimaging	Patient	X
Big Five Personality	Big Five Inventory-2 XS	Patient and caregiver	X	X