Table 4.

Alternate diagnoses for false-positive cases detected by the algorithms

	Alternate diagnosis
False-positive cases detected by self-report + IRD questionnaire, n=39	Osteoarthritis (n=24) Scapulohumeral periarthritis (n=5) Polymyalgia rheumatica (n=3) Primary Sjögren’s syndrome (n=3) Systemic lupus erythematosus (n=2) Osteoporosis (n=1) Lumbar sciatic (n=1)
False-positive cases detected by self-report + reimbursement database, n=10	Psoriatic arthritis (n=7) Systemic lupus erythematosus (n=2) Osteoarthritis associated with inflammatory bowel disease (n=1)

IRD, inflammatory rheumatic disease.