. 2018 Jan 9;3(1):e00123-17. doi: 10.1128/mSystems.00123-17

TABLE 1 .

Infant characteristics

Characteristic	Value for infants who:
Characteristic	Received no antibiotics after the first week	Received antibiotics after the first week^a
No. of samples	604	298
Total no. of infants^b	71	36
No. of infants who received breast milk	52	32
No. of infants who were delivered by C-section	54	22
No. of infants of male sex	34	17
No. of infants with maternal antibiotics	24	20

^{^a}

The infants represented in the column corresponding to those who received antibiotics after the first week (right) were administered antibiotics while in the NICU beyond the first week of life due to late-onset sepsis, necrotizing enterocolitis, or another disease.

^{^b}

All 107 premature infants were in the neonatal intensive care unit (NICU) of the Magee-Women’s Hospital in Pittsburgh, PA.