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Table 1 Measurement instruments

From: Feasibility and effectiveness of a telephone-based social support intervention for informal caregivers of people with dementia: Study protocol of the TALKING TIME project

Caregiver
Variable Instrument/Source No. of Items Measurement Type of Variable
Self-rated mental health Mental Component Summary (MCS) of the General Health Survey Questionnaire Short Form 12 (SF-12) [4, 33] 6 T0 – T1 Primary outcome
Self-rated physical health Physical Component Summary (PCS) of the General Health Survey Questionnaire Short Form 12 (SF-12) [4, 33] 6 T0 – T1 Secondary outcome
Social support Perceived Social Support Caregiving (PSSC) [35] 9 T0 – T1 Secondary outcome
Social conflict Perceived Social Conflict Scale (SCS) [35] 3   Control variable
Caregiver reaction Caregiver Reaction Scale (CRS) [3840] 24 T0 – T1 Secondary outcome
Education level Consortium to Establish a Registry for Alzheimer’s Disease (CERAD) [46] 2 T0 Control variable
Demographic variables Single items 16 T0 – T1 Control variables
Care Recipient
Variable Instrument/Source No. of Items Measurement Type of Variable
Cognition General Practitioner Assessment of Cognition (GPCOG) [42, 43] 6 T0 – T1 Control variable
Activities of daily Living Functional Activities Questionnaire
[44, 45]
10 T0 – T1 Control variable
Challenging behavior Neuropsychiatric Inventory – Q [41] 12 T0 – T1 Secondary outcome
Demographic variables Single items, e.g., age, gender, care dependency (care recipient) 22 T0 – T1 Control variables
Process Evaluation
Variable Instrument (Source) Measurement Process Evaluation Domain
Recruitment strategies Process documents of the TALKING TME study T0 Reach
Numbers of interested, refused, rejected, and included informal caregivers Process documents of the TALKING TIME study Single items (T0) and process documents of the TALKING TIME study Ongoing1
Randomization Process documents of the TALKING TIME study Ongoing
Dropouts Process documents of the TALKING TIME study Ongoing
Participant responsiveness Single items, e.g., quality/satisfaction with the support group content, the group, and its process T1 Fidelity
Quality of delivery Standardized support group protocols from the support group moderator and single items (T1), e.g., quality of the moderator, information booklet, telephone-based preliminary talk Ongoing
Adherence Standardized support group protocols from the support group moderator and single items (T1), e.g., deviations from the intervention protocol, usage of the information booklet Ongoing Dosage
Dose Standardized support group protocols from the support group moderator, e.g., participation of the informal caregivers in the support group calls T1
Socio-demographic characteristics of the participants and care recipients Single items, e.g., age, gender, care dependency (care recipient) T0 – T1 Context
Use of health care services Use of service checklist [49] T0 – T1
  1. 1 Ongoing collection after each TALKING TIME support group meeting