Table 4. Antibiotic usage in NEC cases with and without microbiology tests.

	DOTs [days]		DOTs per number of NEC		DDDs [no]		DDDs per number of NEC
Ward	with*	without**	with*	without**	with*	without**	with*	without**
A	32	66	10.7	13.2	0.4	2.3	0.1	0.4
B	102	0	9.3	ns	0.2	0	0.2	ns
C	154	168	51.3	42.0	2.9	3.4	0.7	0.8
D	23	195	11.5	32.5	0.5	3.9	0.2	0.7
E	61	315	15.3	39.4	0.2	8.1	0.4	1.0
F	0	321	ns	20.1	0	4.3	ns	0.3
TOTAL	372	1 065	18.6	28.0	7.5	21.9	0.4	0.6

*cases of NEC with isolated microbiological agent; **cases of NEC without isolated microbiological agent;

DOTs – days of treatment; DDD – defined daily dose; NEC – necrotizing enterocolitis.