Table 2 Questionnaire items
Conceptual domain | Operational definition | Empirical measure | Number of items | Time point |
|---|---|---|---|---|
Section A: About Gout | ||||
Gout frequency | No. of attacks in the last 12 months/since last contact | Numerical rating scale 0- ≥ 5 | 1 | All |
Age at diagnosis | Age in years | Numerical free text box | 1 | BL |
Acute attack of gout | Acute episode at time of questionnaire | Yes/No | 1 | All |
Allopurinol | Reported use of allopurinol | Yes/No | 1 | All |
Current daily dose of allopurinol | Nine daily dose options: 50 mg-900 mg | 1 | All | |
Section B: How gout affects your life | ||||
Gout concern, wellbeing, productivity, convenience and satisfaction | Gout Impact Scale[11] | 5-item Likert scale | 18 | All |
Illness perception | Modified Illness perception questionnaire[12] | 5-item Likert scale | 4 | BL, 12 months, 36 months |
Section C: General Health | ||||
Physical function | SF36 Physical function sub-scale (PF10)[13] | 3-item Likert scale | 10 | All |
Health Assessment Questionnaire Disability Index[14] | 4-item Likert scale | 17 | All | |
Co-morbidities | Diabetes mellitus, Renal failure, renal calculi, Cerebrovascular accident, Transient ischaemic attacks, ischaemic heart disease, hyperlipidaemia | Yes/No | 9 | BL |
Section D: How you feel | ||||
Depression | Patient health questionnaire (PHQ 9)[15] | 4 point Likert scale | 16 | BL, 12 months, 36 months |
Anxiety | Generalised anxiety disorder questionnaire (GAD)[16] | |||
Section E: Foot and other joint problems | ||||
Hallux valgus | Self-completed line drawings[17] | 5 line-drawings for each foot depicting increasing severity of hallux valgus | 2 | BL, 12 months, 36 months |
Pain | Pain in the hands, hips, knees and feet in the last year | Yes/No | 4 | BL, 12 months, 36 months |
Location of body pain in last 4 weeks | 1 | BL, 12 months, 36 months | ||
Foot pain | Foot pain, aching, stiffness in last month[20] | Frequency on 5-point Likert scale | 1 | BL, 12 months, 36 months |
Foot pain location | Location of foot pain in last four weeks | Self-completed foot manikin[21] | 1 | BL, 12 months, 36 months |
Foot function | Manchester Foot Pain and Disability Index[22] | Frequency on 3-point likert scale | 17 | BL, 12 months, 36 months |
Consultation for foot problems | Consultation with GP, physiotherapy, podiatry, in last 12 months/since last contact | Yes/No | 4 | BL, 12 months, 36 months |
Section F: Work | ||||
Occupational characteristics | Current employment status | 11-response options | 1 | BL, 12 months, 36 months |
Work absence during last 6 months due to joint/back problems | Yes/No | 1 | BL, 12 months, 36 months | |
Ability to do usual job | 5-response options | 1 | BL, 12 months, 36 months | |
Section G: Demographic/socioeconomic characteristics | ||||
Date of birth | Date of birth | Date of birth | 1 | BL |
Gender | Gender | Male/Female | 1 | BL |
Anthropometric characteristics | Height | Meters or feet/inches | 1 | All |
Weight | Kilogram or stones/pounds | 1 | All | |
Marital status | Marital status | 6-response options | 1 | BL |
Living alone | Living alone | Yes/No | 1 | BL |
Adequacy of income | Adequacy of income | 4-response options | 1 | BL |
Education | Higher education | Yes/No | 1 | BL |
Ethnicity | Ethnicity | 6-response options | 1 | BL |
Life-style-characteristics | Frequency of alcohol consumption | 6-response options | 1 | BL |
Weekly amount of beer/spirits/wine consumed | Free-text | 1 | BL | |
Smoking status | 3-response options | 1 | BL | |