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Table 1 Read codes for eligible patients (>50 years old)

From: Activity Increase Despite Arthritis (AÏDA): design of a Phase II randomised controlled trial evaluating an active management booklet for hip and knee osteoarthritis [ISRCTN24554946]

Included Read codes

N05 (and below)

osteoarthritis

14G2

H/O osteoarthritis

N06z5

hip arthritis

N06z6

knee arthritis

N094K

arthralgia of hip

N094M

arthralgia of knee

1M10

knee pain

Excluded Read codes

M160

psoriatic arthropathy

N04 (and below)

inflammatory polyarthropathy

7K2 (and below)

hip joint operations

7K3 (and below)

knee joint operations