From:  Evaluation of the relationship between serum calprotectin and serum amyloid A with musculoskeletal ultrasonographic findings in rheumatoid arthritis patients

 Inflammatory markers among the studied patients of different groups.

Inflammatory markers among the studied patients of different groupsGroup 1 (n = 30): active RA patientsGroup 2 (n = 30): inactive RA patientsGroup 3 (n = 30): control groupKruskal-Wallis testP value
ESR1 (mm/h)
Mean ± SD16.00 ± 2.2152.57 ± 25.7413.73 ± 0.7468.371< 0.001*
Median155014
Range13–2015–13513–15
ESR2 (mm/h)
Mean ± SD23.53 ± 5.2380.03 ± 23.3418.50 ± 1.8364.787< 0.001*
Median258019
Range15–3032–14515–20
CRP (mg/dL)
Mean ± SD28.28 ± 21.263.8 ± 3.121.0 ± 0.067.974< 0.001*
Median6180
Range0–102–950–0
Rheumatoid factor (IU/mL)
Positive1963.3%2583.3%-χ2 23.655< 0.001*
Negative1136.7%516.7%-
Anti-CCP (U/mL)
Positive1963.3%2686.7%-χ2 21.361< 0.001*
Negative1136.7%413.3%-

Data are presented as mean ± SD or frequency (%); the Kruskal-Wallis test was used for comparison among the three groups. χ2: Chi-square test; *: significant as P < 0.05 represents the overall comparison among the three groups; anti-CCP: anti-cyclic citrullinated peptide; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate.