Table 2 Overview of the primary and secondary outcome measures, descriptive variables, and date of data collection

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

x^a

x

x^b

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

x^a

x

x^b

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]

x^c