Table 1.

Outcome measurements of the population-based prospective observational cohort study BeTaSen (Bewegungs-Tandems in den Lebenswelten Chemnitzer Seniorinnen und Senioren: ein Beitrag zur kommunalen Gesundheitsförderung). T1 is baseline, T2 is the end of the intervention period (12 months), and T3 is 6 months after the end of the intervention (study population: older adults aged 75 years or older living in Chemnitz, Germany).

Assessment		Instrument or scale	Time of measurement
Outcome				T1, T2, T3
	Physical function	Short Physical Performance Battery (SPPB) Handgrip strength (handgrip dynamometer)
	Physical activity	OMRON Walking Style One 2.1. Pedometer (7 days) PRISCUS-PAQ
	Psychosocial health	German Depression Scale (DIA-S) Items of Tilburg Frailty Indicator (TFI) Items of social support questionnaire (F-SozU)
	Cognitive function	Montreal Cognitive Assessment (MoCA)
Process
	Feasibility	Documentation of activity tandems and group meetings adherence rates Qualitative interviews and self-administered questionnaire with older adults, mentors, exercise trainers, and communal partners	Each activity tandem or group session Monthly during the activity tandem period and after the end of the individual intervention period (older adults); after the end of intervention in the respective neighborhood (mentors, communal partners)
	Usefulness	Qualitative interviews and self-administered questionnaire with older adults, mentors, and exercise trainers	Monthly during the activity tandem period and after the end of the individual intervention period (older adults); after the end of intervention in the respective neighborhood (mentors, communal partners)
	Implementation (barriers and facilitators)	Qualitative interviews and self-administered questionnaire with mentors, exercise trainers, and communal partners	Monthly during the activity tandem period and after the end of the individual intervention period (older adults); after the end of intervention in the respective neighborhood (mentors, communal partners)