Table 3.

Multiple logistic regression analysis results examining appropriate antibiotic prophylaxis in surgical procedures and appropriateness of timing of SAP administration according to several explanatory variables.

Variable	OR	SE	95% CI	p
Model 1. Appropriate antibiotic prophylaxis in surgical procedures
Log likelihood = −182.3, χ2 = 383.3 (7 df), p < 0.0001, No. of obs = 546
Local anesthesia	8.45	4.2	3.13–22.85	<0.001
Treatment not involving prosthetic implant	0.01	0.01	0.01–0.02	<0.001
Ordinary admission	2.93	0.98	1.52–5.66	0.001
Surgical procedure groups
Abdominal, vascular, breast	1 *
Ophthalmology	2.56	0.8	1.4–4.72	0.002
Plastic and reconstructive	6.14	4.11	1.65–22.83	0.007
Obstetrics, gynecological, urological	0.14	0.11	0.03–0.65	0.013
Prior antibiotic allergies	0.61	0.35	0.2–1.88	0.394
Model 2. Appropriate timing of SAP administration in surgical procedures with SAP indication
Log likelihood = −240.32, χ2 = 165.9 (10 df), p < 0.0001, No. of obs = 475
Treatment not involving prosthetic implant	0.06	0.02	0.03–0.11	<0.001
Charlson comorbidity index =0	0.22	0.09	0.11–0.48	<0.001
Surgical procedure groups
Abdominal, vascular, breast	1 *
Obstetrics, gynecological, urological	0.31	0.13	0.13–0.71	0.005
Plastic and reconstructive	20.33	23.5	2.11–195.9	0.009
Ophthalmology	0.64	0.22	0.32–1.27	0.202
ORL, head and neck, dentoalveolar	0.59	0.29	0.23–1.54	0.283
Older	1.03	0.01	1.01–1.05	0.017
Females	1.49	0.35	0.94–2.37	0.092
Not prior antibiotic allergies	0.55	0.26	0.21–1.41	0.212
Not prior antibiotics use	0.64	0.25	0.3–1.39	0.261

* Reference category.