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Table 1 Measurement domains, survey tools and collection method used at each data collection time point

From: Cluster randomized controlled trial of a peer support program for people with diabetes: study protocol for the Australasian peers for progress study

Variable Component Measurement tools/Questions Base line 6 mth 12 mth Type of administration
Demographic Measures   Age at diagnosis   
   Health Insurance   Postal survey
   Age, Sex, Country of birth, Living Arrangement (Marital status), Education, Income, Employment status,    
   Ethnicity, Health Care Access,    
Clinical Information Current Clinical Measures On insulin, since when, #/day, Most recent HbA1c,  
   Other medical treatments, past medical history   Postal survey
   List of prescribed medications, last dilated eye     
   exam/retinal photo, foot exam, Past medical history,  
  Health before, at and since diagnosis Pre-diagnosis; at diagnosis and post-diagnosis conditions   Postal survey
  Anthropometric Waist circumference (Novel Figure Finder Tape Measure) Collected by project team /or from clinical care provider (CCP)
   Blood Pressure (Omron HEM-907 IntelliSense  
   professional digital blood pressure monitor)     
   Weight (Salter portable weighing scale, model 913)  
   Height (Portable Stadiometer Height Rod)    
  Pathology HbA1c,Total Cholesterol(TC), TC/HDL ratio Pathology for study/ CCP
   Urine microalbumin, Fasting blood glucose, Trig, HDL, LDL,    
Behavioural Physical Activity Single physical activity question (# minutes/week) Postal survey
  Nutrition Cancer Council Food Frequency Questionnaire [22]   FFQ
  Smoking Current/ever smoked/ FFQ /SDSCA Postal survey
  Alcohol Alcohol days/ quantity/ FFQ Postal survey
  Self-care activities (SDSCA) Selfcare activities scale with Toobert, Fisher & Glasgow modifications [23, 24] Postal survey
  Medication Morisky 8-item [25, 26] Postal survey
QOL Assessment of quality of life AQoL-8D [27] and EQ-5D™[28, 29] Postal survey
  Diabetes Distress Diabetes Distress Screening Instrument: DDS4 [30, 31] Postal survey
  Depression PHQ-9 [32] Postal survey
Mediators and Moderators Health literacy [33] Postal survey
  Non-directive vs directive support [12]    
  Availability & satisfaction with diabetes-support from family, friends & health care team [34] Postal survey
  Sources of Support Who are you supported by? Postal survey
  Diabetes Knowledge Michigan Diabetes Research and Training Centre with modification to Australian context [35]   Postal survey
  Self-Efficacy Diabetes Self-Efficacy Scale [36] Postal survey
Use of diabetes services Health-care utilisation GP details, Travel time, waiting time   Postal survey
   Insurance, NDSS membership, DA-Vic membership, GP/ specialists/ health professionals visits over past 6 mths, ECG, vaccinations, hospital stays, etc. based on RACGP guidelines for T2DM management     
   Most recent HbA1c (self-report)     
   Cost of services     
Clinical services Health care utilisation GPAQ ver 2.1 [37]   Postal survey
   Clinical care agreements (annual cycle of care, General     
   Practice Management Plan, Team Care Arrangement) Postal survey
Cost Effective Analysis   # visits past 6 mths to diabetes clinician Postal survey
   # visits past 6 mths to other clinicians  
   # visits past 6 mths for emergency/acute care  
   # overnight stays past 6 mths in hospital (related to your diabetes)  
Peer Training/ Quality Improve. Training effectiveness Usefulness of training   Postal survey
   Extent of content covered     
Process Evaluation   17 item assessment with 3 additional questions regarding most helpful, least helpful and suggestions to improve   Postal survey
   + 2 questions asking availability of participant to other group members [3840]