Table 2 Baseline and follow-up measurements

Functional outcomes

Mobility

Short Form-36 Health Survey (SF-36): subscale on physical functioning [34, 35]

Participation

Keele Assessment of Participation (KAP). Person-perceived, performance based participation [37]

Functional independence

Katz Index of independence in activities of daily living (KATZ) [36]

Quality of life

QoL

One item of the SF-36. Cantril's self anchoring ladder [38]

Possible predictors of functioning and QoL

Pain

Chronic Pain Grade (CPG), domains on pain intensity and disability [47]

Items measuring frequency, duration and intensity of pain [48]

Comorbidity

Presence of various illness (yes/no)

Physical performance

Short Physical Performance Battery Score:

balance (tandem stance), timed 6 m walk, 5x chair stands [49]

Frailty

Unintentional weight loss: Based on BMI [50]

Exhaustion: One item from the SF-36 ("how much of the time in the past 4 weeks did you have a lot of energy?") [50]

Weakness: Measuring grip strength [51]

Slowness: Measuring walking speed [51]

Low physical activity: Physical Activity Scale for the Elderly (PASE) [50, 52, 53]

Utility

EQ-5D+c. Measures health outcome: mobility self-care, usual activities, pain, anxiety/depression and cognition [54]

Functional status

Short Form-36 Health Survey: domains on physical functioning, social functioning and role limitations [35]

Well being

Short Form-36 Health Survey: domains on mental health, vitality and pain [35]

Overall health

Short Form-36 Health Survey: domains on general health perception and health change [35]

Anxiety and depression

Hospital Anxiety and Depression Scale (HADS) [55]

Personal control

Brief Illness Perception Questionnaire (B-IPQ) [56]

Coping with pain

Two- item Coping Strategies Questionnaire (CSQ) [57, 58]

Pain Coping Inventory (PCI): subscale resting (5 items) [59]

Self-efficacy

Arthritis Self Efficacy Scale (ASES) [60]

Mobility outside the home

Access to material goods and services (car, public transport, GP, chemist, internet) and living environment, residential.

Social isolation

and perceived social support

Social Support Scale (SOS) [61]

Body Mass Index

Based on height and weight, measured by a standardized protocol

Falls

Items on past falls

Life style factors

Items on smoking behaviour and alcohol consumption

Sociodemographic characteristics

Age, gender, ethnicity, living arrangements, ZIP code, marital status, education, employment status

Health care utilization and health care needs

General health care use

6-items(yes/no): hospital admissions, unplanned GP visits, homecare, temporary admission nursing or care home, day care and day treatment

Health care use for joint pain

Current use of pain medication, creams, gels or braces. Participation in exercise programmes.