Table 3.

Comparison of cohorts identified by algorithms for definite or probable pseudogout applied to the final datamart of 30,089 patients

	≥1 billing code	Presence of CPP crystals	Combined algorithm: topic modeling approach and/or presence of CPP crystals
Number of patients (n)	12,035	1,630	2,490
Age at last medical visit, years	72.8 (15.6)	76.4 (13.0)	76.3 (12.8)
Female	55.6	50.6	50.8
Race
White	84.7	79.5	81.0
African American	4.8	8.8	7.8
Other	10.5	11.7	11.2
≥1 pertinent billing code	100.0	72.6	74.1
≥1 NLP concept “pseudogout”	34.3	86.1	90.8
Synovial fluid crystal analysis performed, regardless of result	18.9	100.0	86.0
Synovial fluid CPP crystals present	9.8	100.0	65.5
Prescription medications in EHR
Colchicine	17.3	35.1	43.4
NSAID	59.1	69.1	72.7
Oral glucocorticoids	44.4	62.9	67.4

Presented as mean (SD) or percentage unless otherwise indicated