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

Table 3 Multivariate analyses of factors associated with the GBS septic arthritis

Parameter	All (231)	GBS group (87)	Other bacterial group (144)	Adjust odds	95% CI	p-value
Associated joints^a
MCP (n, %)	13, 5.6%	12, 13.8%	1, 0.7%	16.2	1.9–137.2	0.011
PIP (n, %)	14, 6.1%	12, 13.8%	2, 1.4%	7.0	1.3–36.0	0.021
Spine (n, %)	17, 7.4%	12, 13.8%	5, 3.5%	4.6	1.4–14.9	0.011
SC (n, %)	28, 12.1%	19, 21.8%	9, 6.3%	3.2	1.2–8.2	0.017
Associated factors^b
Tenosynovitis (n, %)	37, 16.0%	34, 39.08%	3, 2.08%	21.0	5.5–79.6	< 0.001
Rainy season (n, %)	130, 56.3%	62, 71.3%	68, 47.2%	3.6	1.8–7.5	< 0.001
Oligo-polyarthritis (n, %)	109, 47.2%	63, 72.4%	46, 31.9%	2.6	1.3–5.2	0.008
Associated laboratory data^c
Baseline hemoglobin (mg/dL): (mean ± SD)	11.0 + 2.2	11.7 + 2.4	10.5 + 2.1	1.3	1.1–1.5	< 0.001

p < 0.05 defined statistical significance,
GBS Streptococcus group B, MCP Metacarpophalangeal, PIP Proximal interphalangeal, SC Sternoclavicular
^aAdjusted for knee, ankle, shoulder, wrist, SC, elbow, spine, MCP, PIP, hip, AC, MTP, IP of toe and SI joints
^bAdjusted for age, gender, rainy season, body mass index, diabetic mellitus, end-stage renal disease, liver disease, oligo-polyarthritis, upper joint involvement, tenosynovitis, tendon rupture, ocular involvement and central nervous system involvement
^cAdjusted for baseline serum WBC, hemoglobin, creatinine, hs-CRP, AST and ALT

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