Previous antibiotic therapy as independent risk factor for the presence of vancomycin-resistant enterococci in surgical inpatients. Results from a matched case-control study

Table 1 Selection of patients for the case and control groups

	cases	controls
patients fullfilling criteria for inclusion¹	239	8078
patients after application of criteria for exclusion²	118	1424
after matching	118	118
exclusion due to incomplete data of a case	1	1
exclusion due to incomplete data of a control	1	1
final matched groups	116	116

¹Inclusion criteria: inpatient between second half of 2013 to 2016 on a surgical ward or a surgical intensiv care unit and detection of VRE later than 48 h after admission (cases) or VRE-negative (controls).
²Exclusion criteria: inpatient on a non-surgical ward or in the gynaecology and obstetrics clinic for more than 2 days before admission to one of the included surgical wards, or younger than 18 years.

ISSN: 1471-2334