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Table 3 Study parameters, properties of the corresponding instruments and their measurement point(s)

From: A goal management intervention for polyarthritis patients: rationale and design of a randomized controlled trial

Content Measurement point Scale Reference Example item Scale range Cronbach’s alpha a Items Response options
Depression Intake, T0, T1, T4 Hospital Anxiety and Depression Scale (HADS) Zigmond & Snaith, 1983 [60] I have lost interest in my appearance. 0-21 .81 7 various response format (0–3)
Anxiety Intake, T0, T1, T4 HADS Zigmond & Snaith, 1983 I feel tense or wound up. 0-21 .83 7 various response format (0–3)
Positive affect T0, T1, T4 Positive subscale of the Positive and Negative Affect Schedule (PANAS) Watson, Clark, & Tellegen, 1988 [67] Rate how you felt during the past week: e.g., attentive, interested. 10-50 .92 10 very slightly or not at all (1) - very much (5)
Purpose in life T0, T1, T4 Purpose In Life scale (PIL) Ryff, 1989 [68]; Ryff & Keyes, 1995 [69] My daily activities often seem trivial and unimportant to me. 6-30 .82 6 strongly disagree (1) -strongly agree (5)
Social participation T0, T1, T4 Family role, autonomy outdoors, social relations and work and education subscales of the Impact on Participation and Autonomy (IPA) questionnaire Cardol, De Haan, De Jong, Van den Bos, & De Groot, 2001 [70] Domain autonomy outdoors: The possibility to spend my (spare) time like I want to is… 0-4 .76 25 very good (0) - very poor (4)
Pain T0, T1, T4 1 item with 100 mm visual analogue scale - Please indicate how much pain you had in the last 7 days due to your condition? 0-100 - 1 no pain at all (0) -unbearable pain (100)
Fatigue T0, T1, T4 1 item with 100 mm visual analogue scale - Please indicate your level of fatigue averaged over the past 7 days? 0-100 - 1 no fatigue (0) -completely exhausted (100)
Physical functioning T0, T1, T4 RAND-36 physical function subscale Ware & Sherbourne, 1992 [71]; Van der Zee & Sanderman, 2012 [72] Does your health limit you in these activities? If so, how much? E.g., Walking a half mile. 10-30 - 10 Yes, limited a lot (1) – No, not limited at all (3)
Goal maintenance T0, T1, T4 Tenacious Goal Pursuit (TGP) Brandtstädter & Renner, 1990 [73] When faced with difficulties, I usually double my efforts. 15-75 .73 15 strongly disagree (1) -strongly agree (5)
Goal adjustment T0, T1, T4 Flexible Goal Adjustment Scale (FGA) Brandtstädter & Renner, 1990 I adapt quite easily to changes in plans or circumstances. 15-75 .79 15 strongly disagree (1) -strongly agree (5)
Goal disengagement T0, T1, T4 Goal Adjustment Scale Wrosch, Scheier, Miller, et al., 2003 [42] If I have to stop pursuing an important goal in my life, it’s easy for me to reduce my effort towards a goal. 4-20 .53 4 strongly disagree (1) -strongly agree (5)
Goal reengagement T0, T1, T4 Goal Adjustment Scale Wrosch, Scheier, Miller, et al., 2003 If I have to stop pursuing an important goal in my life, I seek other meaningful goals. 6-30 .88 6 strongly disagree (1) -strongly agree (5)
Goal management strategies T0, T1, T4 Goal Management Strategy Vignettes (GMSV)   See article’s text - - - Open ended
Coping versatility T0, T1, T4 Coping Flexibility Questionnaire (COFLEX) Vriezekolk, Van Lankveld, Eijsbouts, Van Helmond, Geenen, & Van den Ende, 2012 [51] I can easily change my approach if necessary. 9-36 - 9 rarely or never (1) –almost always (4)
Self-efficacy pain T0, T1, T4 Arthritis Self-Efficacy Scale Lorig, et al., 1989 [30] I am certain that I can keep arthritis pain from interfering with my sleep. 1-5 .83 5 strongly disagree (1) -strongly agree (5)
Self-efficacy for other symptoms T0, T1, T4 Arthritis Self-Efficacy Scale Lorig, et al., 1989 I am certain that I can control my fatigue. 1-5 .82 6 strongly disagree (1) -strongly agree (5)
Demographics T0 Sex, age, marital status, education and current state of employment - - - N.A. 6 various response format
Disease characteristics T0 Diagnosis and disease duration - - - N.A. 2 Various response format
Co-morbidities T0 Checklist with 15 categories of conditions b Based on the International Classification of Diseases (ICD-10: WHO, 1992) - 0-16 N.A. 16 -
Medication use T0, T1, T2, T3, T4 - - See article’s text N.A. N.A. 2 See text
Utilities T0, T1, T4 EQ-5D Brooks, 1996 [74]; Lamers, McDonnell, Stalmeier, Krabbe, & Busschbach, 2006 [75] I have no problems in walking about. 1-3 - 15 No problem (1) - extreme problems (3)
Direct medical costs T0, T1, T2, T3, T4 - - See article’s text N.A. N.A. 3 Open ended
Indirect non-medical costs T0, T1, T2, T3, T4 - - See article’s text N.A. N.A. 7 Open ended
Price estimate T1 - - See article’s text N.A. N.A. 1 In euros for de complete course
  1. a Arends et al., 2013; b Respondents could also indicate ‘other conditions not listed’.