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Table 3 Instruments and variables.

From: Blood test ordering for unexplained complaints in general practice: the VAMPIRE randomised clinical trial protocol. [ISRCTN55755886]

Instrument Variables Time points Population Method
   T0 T1# T1.5# T6 T12   - Provision - Person who completes questionnaire (- Comments)
GPs' background data Personal data x      All GPs - By mail
  Practice characteristics x       - GP
  CME x       
  Laboratory facilities available in practice x       
Complaint registration form (for each individual type of complaint) Symptoms x x     All patients - Present in practice
  Signs x x      - GP
  Working hypothesis x x      
  Degree of unexplainedness x x      
  Degree of suspicion of serious pathology x x      
  Degree of insecurity of GP x x      
  Satisfaction of GP x x      
Patients' background data (included in patient questionnaire) Date of birth x x x x x All patients - Handed out by GP (T0, T1)
  Country of birth x x x x x   - By mail (T1.5-T12)
  Sex x x x x x   - Patient
  Marital status x x x x x   
  Type of health insurance x x x x x   
  Level of education x x x x x   
Patient questionnaire Intensity of complaints x x x x x All patients - Handed out by GP (T0, T1)
  Course of complaints x x x x x   - By mail (T1.5-T12)
  Satisfaction with care x x      - Patient
  Anxiety x x      
  Quality of life x x x x x   
  - RAND 36        
  - Euroqol thermometer        
  Utilisation of health care x x x x x   
Test ordering form Quality of test ordering x* x*     All patients - Present in practice
  Quantity of test ordering x x      - GP
Test result form Test results x* x*     All patients - Laboratory
         - Laboratory staff
Record examination form Final diagnosis      x All patients - Practice/university
  Utilisation of health care      x   - Researcher
  Use of watchful waiting strategy      x   
   Meeting 1 Meeting 2 Practice visit   
Reports of small group meetings Participation x x   All GPs in intervention group - Meeting room
  Learning effects x x    - Researcher
Evaluation forms of small group meetings Valuation of programme x x   All GPs in intervention group - Meeting room
  Learning effects x x    - Researcher
  Suggestion for improvement x x    
GP interview in practice Barriers and facilitators during change      x All GPs in intervention group - Practice
  Stages of change      x   - GP
Cost registration Costs of development and organising of strategy x x x   - University
         - Researcher
  1. * T0 for patients randomised to group 1, T1 for all patients but only if they revisit their GP
  2. # T1 is the time point to measure a follow-up visit by the patient 4 weeks after inclusion. If a patient does not return to the GP, a questionnaire is sent by mail after 6 weeks. This time point is indicated as T1.5.