Table. Matched case–control study of a CPE outbreak in a haematological ward, France, January 2017–June 2018 (n = 76).

Variable	Cases (n = 19)	Controls (n = 57)	OR	95% CI	p
Median (IQR)
Age in years	58 (40–70)	63 (55–67)	1.0	0.9–1.0	0.38
Length of stay (previous 6 months, in days )	28 (13–71)	54 (27–96)	1.0	1.0–1.0	0.11
n (%)
Men	8 (42)	37 (65)	0.4	0.1–1.2	0.10
Haematopoietic stem cell transplantation	14 (74)	39 (68)	1.3	0.4–4.3	0.65
Antibiotic exposure (previous month)	18 (95)	45 (80)	4.5	0.5–36.6	0.17
Immunosuppressive therapy (previous month)	17 (89)	51 (89)	1.0	0.2–5.3	1.00
Hospitalisation in a room with OXA-48 CPE-positive toilet	14 (74)	15 (26)	6.2	2.0–19.6	0.002

CI: confidence interval; CPE: carbapenemase-producing Enterobacterales; IQR: interquartile range; OR: odds ratio.

Multiple variables can apply to more than one case.