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Table 2 Data collection, information sources and follow-up

From: Effectiveness and cost-effectiveness of a health coaching intervention to improve the lifestyle of patients with knee osteoarthritis: cluster randomized clinical trial

Variables      Data collection
      Baseline *Follow up from recruitment
Clinical dependent variables Measurement instrument Type of response Scoring (total and per item) Range Before intensive phase After intensive phase 3 months 6 months 12 months
Qual ity of Life WOMAC (Batl le, 1999) Likert (0=none to 4=very much) TOTAL=24 17= functional l imitation 5=pain 2= sti ffness 0-96 X X X X X
Pain ICOAP (Mai l lafert, 2009) Likert (0=none to 4=very much) TOTAL = 11 5= constant pain 6= intermittent pain 0-44 X X X X X
Weight (in Kg.)* Scale at the PCC Quantitative (kg.) - 0 - ∞ X X X X X
Physical Activity IPAQ (Puig, 2012) Duration + Frequency of Moderate to Intense TOTAL= 7 0 - 3000 MET X X X X X
Physical Activity* Pedometer Quantitative - 0 - ∞      
Nutrition PREDIMED (Mediterranean Diet Adherence Questionnaire Dichotomous (YES= 1 point NO= 0 points) TOTAL = 14 12= frequency of consumption of foods 2= Mediterranean food habits 0-14 X X X X X
Other Variables          
Socio-demographic          
Age, gender, educational level, work status, number of children Ad-hoc Questionnaire Nominal - - - X    
Clinical     -      
Drug Prescription Ad-hoc Questionnaire Nominal 1 - X X X X X
Diagnostic tests Ad-hoc Questionnaire Nominal 1 - X     X
Waist Circumference Ad-hoc Questionnaire Quantitative (cm.) 1 - X X X X X
Height Ad-hoc Questionnaire Quantitative (cm.) 1 - X     X
Comorbidities Ad-hoc Questionnaire Nominal 1 - X X X X X
Duration of Disease in Years Ad-hoc Questionnaire Quantitative (years) 1 - X     
Duration Knee Osteoarthritis in Ad-hoc Questionnaire Quantitative (years) 1 - X     
Costs-related    -       
Direct Medical    -       
Cost of coaching in osteoarthrosis Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of visits to the GP Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of visits to the nurse Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of visits to the physiotherapist Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of visits to special ist MD Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of Medical Tests Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of Pharmacological Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Operating Costs of the PCC Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of Disposable Medical Equipment Ad-hoc Questionnaire Quantitative (euros) - - X X X X X
Cost of transport (ambulance) Ad-hoc Questionnaire Quantitative (euros) -   X X X X X
Cost of Home Assistance Ad-hoc Questionnaire Quantitative (euros) -   X X X X X
Indirect Medical    -       
Costs due to loss of productivity (days of sick leave) Ad-hoc Questionnaire Uantitative (euro -   X X X X X
  1. * Monthly.