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Table 1 Likelihood of finding elevated C-reactive protein (CRP) tests to week 16 after initial tests at baseline

From: A single determination of C-reactive protein does not suffice to declare a patient with a diagnosis of axial spondyloarthritis ‘CRP-negative’

Proportion of subsequent CRP tests elevated Baseline CRP test normal (n = 26) Baseline CRP test elevated (n = 80)
0% 13 (50%) 0 (0%)
> 0–20% 1 (4%) 1 (1%)
> 20–40% 4 (15%) 3 (4%)
> 40–60% 4 (15%) 11 (14%)
> 60–80% 1 (4%) 6 (8%)
> 80–100% 2 (8%) 4 (5%)
100% 1 (4%) 55 (69%)
  1. Data included are from weeks 0, 1, 2, 4, 8, 12, and 16. Elevated CRP was defined as CRP > upper limit of normal (7.9 mg/L) and values ≤ 7.9 mg/L were considered normal