Table 2.

Overview of the primary and secondary outcome measures, descriptive variables, and date of data collection

	Variables	T0a	T0b	IAa	T1	IAb	T2
Sociodemographics
D	Age, sex, education, living conditions	x
Medical information & comorbidity
D	Diagnosis relevant for rehabilitation	x
D	Cumulative Illness Rating Scale-Geriatric [35]	x
D	Pain		x		x		x
D	Intercurrent medical events (diseases, accidents)		x	xa	x	xb	x
D	Medication (type, dosage, frequency)		x		x		x
Health-related quality of life and resource use
S	EuroQol-5-Dimension 5-Level [36]		x		x		x
S	Adapted version of the questionnaire for the use of medical and non-medical services in old age (FIMA) [37]				x		x
Information on general physical health condition, body weight, and nutritional & gastrointestinal status
S	Simplified Nutrition Appetite Questionnaire [38]	x	x	x	x		x
S	Mini Nutritional Assessment—short form [39]		x		x		x
D	Global Leadership Initiative on Malnutrition criteria [40]	x
D	Subjective Global Assessment [41]	x
Anthropometric data
D	Body weight	x	x		x		x
D	Ulnar length		x
D	Arm circumference		x		x		x
Frailty
S	Groningen Frailty Indicator [42]		x		x		x
S	Clinical Frailty Scale [43]		x		x		x
Neuropsychological status
D	Trail Making Test (A & B) [44]		x
Falls, concerns about falling, and management of falls
S	Falls Efficacy Scale International - short form [45]		x		x		x
S	Perceived Ability to Manage Falls [46]		x		x		x
S	Number of falls		x	xa	x	xb	x
Social participation, mobility, physical capacity, and activity
P, S	Modified Reintegration to Normal Living Index [47]		x		x		x
S	Late-Life Function and Disability Instrument – short form (disability component) [48, 49]		x		x		x
S	Life-Space Assessment for Persons with Cognitive Impairment [50, 51]		x		x		x
P, S	Short Physical Performance Battery [52]		x		x		x
S	Handgrip strength [53]		x		x		x
S	Physical activity assessed with body-worn sensors		x		x		x
Goal attainment and training adherence (only in intervention groups)
D	Goal Attainment Scale [54]				x
D	Training diary				x		x
Technology experiences
D	Experience with the use of smartphones, tablets, or laptops		x
D	Mobile Device Proficiency Questionnaire-16 [55]		x
D	System Usability Scale [56]				xc

Abbreviations: P Primary outcome measure, S Secondary outcome measure, D Descriptive measure, T_0a Assessment by clinical physician, T_0b Baseline assessment, T₁ 3-month assessment, T₂ 6-month assessment, IA Interim assessment (^a within the intervention period, ^b within the follow-up period)

 ^arecorded once a week, ^brecorded once a month, ^conly in the tablet intervention group