Table 2.

Results of statistical analyses

Effect/variable	OR	95% CI	P
Univariate model
Clinical
Age (units = 10 years)	0.64	0.40–1.05	0.0760
Gender (female vs male)	1.43	0.46–4.42	0.5362
Race (black/African American vs white)	0.31	0.07–1.39	0.1272
Chronic Health Points score (units = 5)	0.15	0.01–1.58	0.1143
Acute Physiology score (units = 10)	0.32	0.12–0.84	0.0215
Total APACHE II score (units = 10)	0.24	0.09–0.67	0.0064
Did fever go away ≤ 72 h? (No vs Yes)	0.26	0.07–0.96	0.0424
Was surgery performed ≤ 30 days? (No vs Yes)	3.93	1.03–14.99	0.0452
Duration of antibiotic treatment (units = 7 days)	1.27	1.03–1.56	0.0259
Serologya
NAb_AT	1.90	0.87–4.15	0.1085
NAb_LukAB	1.97	0.91–4.26	0.0857
IgG_AT	2.64	1.05–6.63	0.0392
IgG_ClfA	2.28	0.88–5.93	0.0899
IgG_ClfB	2.20	0.78–6.23	0.1386
IgG_DT	1.86	0.77–4.50	0.1658
IgG_FnbpA	1.79	0.63–5.08	0.2751
IgG_LukAB	2.47	0.95–6.42	0.0637
IgG_MntC	1.17	0.60–2.31	0.6420
IgG_SdrC	0.74	0.25–2.24	0.5977
IgG_TSST1	1.29	0.77–2.16	0.3284
IgM_AT	1.37	0.31–5.99	0.6785
IgM_ClfA	4.32	1.45–12.85	0.0086
IgM_ClfB	2.17	0.82–5.73	0.1175
IgM_DT	1.53	0.64–3.65	0.3378
IgM_FnbpA	4.65	1.35–16.07	0.0151
IgM_LukAB	1.12	0.44–2.81	0.8159
IgM_MnTc	1.60	0.65–3.96	0.3044
IgM_SdrC	10.10	2.04–49.92	0.0046
IgM_TSST1	1.31	0.55–3.13	0.5467
Staphylococcus aureus isolate
Haemolytic activity (10‐fold increase)	1.75	0.92–3.33	0.0903
AT ELISA (10‐fold increase)	2.02	0.73–5.57	0.1731
MSSA vs MRSA	1.78	0.55–5.77	0.3356
fnbA (negative vs positive)	0.48	0.15–1.55	0.2195
hla (negative vs positive)	0.50	0.10–2.35	0.3763
tst (negative vs positive)	1.45	0.34–6.18	0.6175
Multivariate model
Total APACHE II (score increase by 10)	0.34	0.11–1.05	0.0605
Haemolytic activity (10‐fold increase)	2.94	1.05–8.27	0.0409
IgM SdrC (10‐fold increase)	13.95	1.18–164.49	0.0363
IgM ClfA (10‐fold increase)	5.72	1.16–28.24	0.0322

MRSA, methicillin‐resistant S. aureus; MSSA, methicillin‐susceptible S. aureus.

^aSerology OR corresponds to a 10‐fold increase in antibody levels.