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Table 1 Demographic and clinical data for the patients according to the diagnosis based on the analysis of joint fluid

From: A prospective evaluation of ultrasound as a diagnostic tool in acute microcrystalline arthritis

  MSU (n = 60)a CPP (n = 37)a No crystals (n = 21) P value
Sex (% male) 92 68 79 NS
Age (years), mean (SD) 65 (12) 75 (15) 67 (10) NS
First attack of arthritis (%) 41 70 67 NS
Monoarticular arthritis (n) 31 26 11 <0.05b,c
Oligoarticular arthritis (n) 29 11 10 <0.05*
CRP (mg/l), mean, n = 10 mg/l (SD) 108 (77) 76 (84) 46 (42) <0.05d
Urate (μmol/l), mean (SD) 477 (160) 335 (113) 390 (131) <0.05e
  1. CPP calcium pyrophosphate, CRP C-reactive protein, MSU monosodium urate, NS not significant, SD standard deviation
  2. aIt was hard to determine which crystal was responsible for the acute flare, so the nine patients with both crystals were added to both the MSU (gout) and CPP (chondrocalcinosis) groups
  3. bNo crystal versus CPP and MSU
  4. cCCP versus gout and no crystal
  5. dNo crystal versus gout
  6. eCCP versus gout