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Table 3 Secondary outcomes and control variables

From: Well informed physician-patient communication in consultations on back pain – study protocol of the cluster randomized GAP trial

 

t0-physician

t0-patient

t1-patient

t2-patient

t3-patient

t1-physician

t2-physician

Secondary outcomes (survey data)

Self-reported self-efficacy (patient)

Perceived Efficacy in Patient-Physician Interactions (PEPPI)-Questionnaire [48]

 

X

 

X

   

One Item of Perceived Efficacy in Patient-Physician Interactions (PEPPI)-Questionnaire [48]

  

X

    

Health Literacy (patient)

Health Literacy Questionnaire (HLQ) [31, 49]

 

X

 

X

   

Health literacy global questions

  

X

    

Pain intensity (patient)

Visual analog scale (VAS) [50]

 

X

 

X

   

Accordance of provided and needed information (physician)

Domains “Adequacy of information” and “Usability of information” of the Decision Attitude Scalea,b [51]

     

X

 

Self-developed item whether content fits expectations

     

X

 

Usability (physician)

System Usability Scale (SUS)a,b [52]

     

X

 

Self-developed items on usability

     

X

 

Use of portal (physician)

Self-developed items on actual use of portalb

     

X

X

Secondary outcomes (routine data)

Patient’s days of sick leave

    

X

  

Patient’s back pain related costs for the health care system

    

X

  

Control variables (survey data)

Patient

Back Belief Questionnaire [53]

 

X

     

Sociodemographic data

 

X

X

X

   

Internet Use

 

X

     

Medical data

 

X

 

X

   

Physician

Sociodemographic data

X

      

Structural features of the practice (kind of practice, patients per quarter, number of employees, location and region)

X

      

Control variable (web analytics)

Portal use by patients

 

Throughout the intervention phase (after consultation)

Portal use by physicians

Throughout the intervention phase

  1. aInstrument will be adapted so that the physicians assess the portal
  2. bonly intervention group