An outbreak of multi-drug resistant Escherichia coli urinary tract infection in an elderly population: a case-control study of risk factors

Table 4 Adjusted model of risk factors for MDR E coli infection, antibiotics as number of courses

	OR	95 % CI
Full model (N = 192)
Courses of resistant^a antibiotics in hospital
None	1.0
1	2.9	1.0–8.3
2	2.6	0.7–9.7
3+	6.5	1.4–30.5
Level of care
Independent	1.0
Assisted living	2.6	1.1–6.2
High dependency	9.4	2.3–38.7
Hospital admission	1.2	0.5–2.9
Recurrent UTI	2.1	0.9–4.7
Diabetes	2.6	1.1–6.1
Female gender	2.6	1.1–6.0
Age
65–74	1.0
75–84	1.5	0.5–3.9
85+	2.1	0.7–6.1
Excluding diabetes and recurrent UTI (N = 226)
Courses of resistant^a antibiotics in hospital
None	1.0
1	4.0	1.5–10.5
2	4.4	1.3–15.6
3+	6.5	1.6–25.9
Level of care
Independent	1.0
Assisted living	2.1	1.0–4.4
High dependency	6.9	2.0–23.2
Hospital admission	1.3	0.6–2.8
Female gender	3.2	1.5–6.8
Age
65–74	1.0
75–84	1.4	0.6–3.5
85+	2.4	0.9–6.3

^a ‘Resistant’ = antimicrobials to which the MDR E coli was resistant, i.e. gentamicin, quinolones, trimethoprim, trimethoprim-sulfamethoxazole, and amoxicillin

ISSN: 1471-2334