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Table 1 Variables, measuring instruments and data sources

From: The German MultiCare-study: Patterns of multimorbidity in primary health care – protocol of a prospective cohort study

Morbidity Measuring instrument Data source
Diagnoses ICD-10 codes chart review
Diseases self-developed questionnaire GP interview
  self-developed questionnaire patient interview
  Four-Dimensional Symptom Questionnaire (4DSQ) [11] patient interview
  Geriatric Depression Scale (GDS) [12] patient interview
  Clinical Dementia Rating (CDR) [13] rated by interviewer
Functional Status   
Activities of daily living Barthel Index [22] patient interview
  Instrumental Activities of Daily Living (IADL) Scale [23] patient interview
Motor skills FFB-Mot [24] patient interview
Vision and hearing 2 items rated on a 4 point scale patient interview
Cognitive impairment CERAD [25] subtests word list and animal naming cognitive tests by interviewer
  Letter Digit Substitution Test (LDST) [26] cognitive tests by interviewer
Pain Graded Chronic Pain Scale (GCPS) [27] patient interview
Health-related quality of life EuroQoL (EQ-5D) Scale [28] patient interview
Resources/Risk Factors   
Physical risk factors Body-Mass-Index and Waist-to-Hip-Ratio physical checkup by GP
Physical activity International Physical Activities Questionnaire (IPAQ) [29] patient interview
Nutrition 12 items for frequency and portion size of nutriments patient interview
Alcohol use AUDIT-C [30] patient interview
  total amount of alcohol consumption per week patient interview
Smoking behavior 9 items indicating current smoking status and pack years patient interview
General self-efficacy General Self-efficacy Scale [31] patient interview
Social support F-SOZU K14 [32] patient interview
Medical care Patient Assessment of Chronic Illness Care (PACIC) [33] patient interview at baseline
  age and gender of GP/size and location of surgery GP interview
Utilization of medical services (incl. medication) 15 items (short form), respectively 91 items (long form) patient interview
Sociodemographic Data   
Age and gender age and gender chart review
Migrant status standardised indicators for mapping migrant status [34] patient interview at baseline
Marital status marital status patient interview
Living conditions independent or assisted living patient interview
Household size household size/household members under 15 years patient interview
Education CASMIN classification [35] patient interview at baseline
Former occupation German epidemiological standard questionnaire [36] patient interview at baseline
Income household size adjusted net income patient interview
Wealth home ownership patient interview