Validity of gout diagnosis in Swedish primary and secondary care - a validation study

Table 4 Number of patients displaying gout characteristics

Gout characteristics	Primary care group (n = 262)		Rheumatology group (n = 132)
	Men	Women	Men	Women
	n = 198 (%)	n = 64 (%)	n = 106 (%)	n = 26 (%)
Increased^a serum uric acid	139 (70/89)^1,b	41 (64/87)^1,c	82 (77/80)^1,d	15 (58/65)^1,e
Analysis of MSU crystals in SF (%)	6 (3)	0	34 (32)	1 (4)
Presence of tophi (%)	3 (2)	3 (5)	27 (23)	4 (15)

^aMale >420 μmol/L, female >360 μmol/L
^b41 missing values
^c17 missing values
^d3 missing values
^e4 missing values
¹Percentage defined as the proportion with abnormally high values out of: 1) all patients reviewed and 2) those with an available test results

ISSN: 1471-2474