Table 3. Disease severity and adjunctive treatment by regimen.

Clinical Characteristic	Colistin+Carbapenem (n = 21)	Other Regimens (n = 16)	p-value
Median APACHE II score (range)	19 (10–29)	20 (8–28)	0.93
Co-pathogen present, no. (%)	9 (43%)	9 (56%)	0.52
Intensive care unit, no. (%)	20 (95%)	20 (100%)	1.00
Mechanical ventilation, no. (%)	20 (95%)	20 (100%)	1.00
Ventilator-associated pneumonia, no. (%)	17 (81%)	15 (94%)	0.36
Associated infection, no. (%)	3 (14%)	5 (31%)	0.25
Inhaled colistin, no. (%)*	10 (48%)	5 (31%)	0.50
Median duration of treatment, days (range)	15 (5–44)	7.5 (3–52)	0.09

^*Only patients with XDR-Ab pneumonia received inhaled colistin; all patients receiving inhaled colistin were on concomitant systemic colistin therapy.