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Table 4 The laboratory profiles in GBS and other bacterial septic arthritis group

From: Group B streptococcus is the most common pathogen for septic arthritis with unique clinical characteristics: data from 12 years retrospective cohort study

Variable All (231) GBS group (87) Other bacterial group (144) p-value
WBC in synovial fluid (cells/cu.mm.): Median (IQR25-IQR75) 53,000.0 (25,200.0-110,720.0) 54,000.0 (25,600.0-131,000.0) 52,800.0 (24,030.0-106,000.0) 0.640
Hb (mg/dL): Mean ± SD 11.0 + 2.2 11.7 + 2.4 10.5 + 2.1 < 0.001
Serum WBC (cells/cu.mm.): Median (IQR25-IQR75) 13,400.0 (9500.0-18,800.0) 15,000.0 (10,700.0-19,900.0) 12,500.0 (8550.0-16,950.0) 0.029
BUN (mg/dL): Median (IQR25-IQR75) 21.8 (13.8–39.6) 18.4 (12.9–35.1) 24.4 (14.5–43.6) 0.040
Cr (mg/dL): Median (IQR25-IQR75) 1.0 (0.8–2.2) 0.90 (0.8–1.5) 1.20 (0.8–2.5) 0.033
AST (IU/L): Median (IQR25-IQR75) 39.0 (26.5–69.8) 37.0 (25.0–59.0) 42.0 (27.0–71.0) 0.182
ALT (IU/L): Median (IQR25-IQR75) 33.5 (20.0–55.5) 35.0 (24.0–59.0) 32.0 (17.0–54.0) 0.175
ESR (min/hr): Median (IQR25-IQR75) 109.0 (86.0–119.0) 104.5 (85.0–118.0) 111.0 (86.0–119.0) 0.558
hs-CRP (mg/L): Median (IQR25-IQR75) 185.2 (100.8–300.0) 226.9 (142.2–300.0) 157.0 (85.3–267.9) 0.030
Positive hemoculture (n, %) 157, 68% 62, 71.3% 95, 66.0% 0.404
Positive synovial fluid culture (n, %) 155, 67.1% 55, 63.2% 100, 69.4% 0.329
  1. p < 0.05 defined statistical significance, IQR Interquartile range, WBC White blood cell, Hb Hemoglobin, BUN Blood urea nitrogen, AST Aspartate aminotransferase, ALT Alanine Aminotransferase, ESR Erythrocyte sedimentation rate, hs-CRP High Sensitivity C-Reactive Protein, GBS Streptococcus group B