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Table 2 Demographic characteristics and ultrasound pathology findings in each of four pathology groups

From: Ultrasound-detected pathologies cluster into groups with different clinical outcomes: data from 3000 community referrals for shoulder pain

  Bursitis (limited inflammation) (n = 1280) Bursitis (extensive inflammation) (n = 595) RC tear (n = 558) Limited pathology (n = 567)
Percentage of sample 43% 20% 18% 19%
Age, years, mean (SD) 47.6 (11.5) 64.2 (10.5) 69.1 (11.2) 46.1 (13.5)
Female sex, % 54 52 51 46
Pain duration, months,a median (IQR) 5 (3–10) 5 (3–9) 5 (3–9) 4 (3–8)
Steroid injection at time of scan, % 44 37 13 26
RC tear, yes/no, % 2 24 100 6
Full-thickness RC tear, % 1 13 86 <1
Bursitis, % 100 94 30 7
Impingement, % 88 65 91 6
Calcific tendinitis, % 14 18 5 9
ACJ degeneration, % 26 83 54 15
Glenohumeral OA, % <1 10 16 2
Adhesive capsulitis, % <1 3 <1 12
Biceps tenosynovitis, % <1 25 10 2
Rotator cuff tendinopathy, % 23 92 24 20
Probability of membership, mean 0.88 0.80 0.89 0.93
  1. ACJ Acromioclavicular joint, OA Osteoarthritis, RC Rotator cuff
  2. a n = 507, 198, 233 and 227 in groups 1–4, respectively