Table 8. Hertfordshire Cohort Study component of the European Study of Osteoarthritis (EPOSA).

Objective:	To identify risk factors for, and consequences of, osteoarthritis (OA) for individuals and society and to explore cross-country differences in these patterns.
Methodology:	Collaborative study with five other centres in Germany, Holland, Sweden, Spain and Italy 30. HCS fieldwork conducted by a nurse home visit followed by x-rays at Hertford County Hospital. HCS EPOSA participants were recruited from men and women who had previously participated in the musculoskeletal follow-up study.
Key data availability:
•    Osteoarthritis questionnaire (affected sites, functional limitation, clinical procedures, joint     replacement surgery) •    WOMAC hip and knee pain, stiffness and function scores •    Oxford hip and knee pain and limitation scores •    Auscan pain, stiffness and function scores •    EuroQoL EQ-5D quality of life (mobility, self care, activities, pain, anxiety, health) •    Use of assistive devices •    Falls •    Fractures •    Strawbridge frailty score •    Fried frailty components •    Townsend disability scale •    Current medications •    Cigarette smoking •    Alcohol consumption •    Household composition •    Housing tenure •    Short food frequency questionnaire •    Nutrient intake from dietary supplements •    Longitudinal Ageing Study Amsterdam physical activity questionnaire (LAPAQ) •    Health service use (hospitalisations, operations, GP and health professional consultations) •    Formal and informal home care •    Mobility problems •    Co-morbidity •    Mini mental state examination (MMSE) •    Height; weight; waist, hip and calf circumferences •    Clinical hand examination for pain, •    swelling and tenderness •    Clinical hip and knee examination for flexion, rotation, pain, swelling and tenderness •    Timed balance tests •    Timed 6m up-and-go test and 8 foot walk •    Chair rises •    Grip strength (Jamar hand-grip dynamometer) •    Lubben social network score •    Pearlin mastery scale score •    Maastricht Social Participation Profile (MSPP) scores •    Pittsburgh Sleep Quality questionnaire (sleep duration, difficulties, disturbances) •    Anxiety and depression (HAD) scores •    14-day pain calendar •    X-ray of hip; antero-posterior and lateral x-rays of both knees (Kellgren/Lawrence grading      scores, osteophytes, joint space and sclerosis)