TABLE 3.

Effect of postmenstrual age, antibiotics, and probiotic exposure on alpha diversity in preterm infants.

	Species richness	Shannon diversity
	β (95% CI)	β (95% CI)
Cohort†	30.1 (−14.0, 74.3)	0.00164 (−1.78, 1.83)
Postmenstrual age	0.706 (0.289, 1.11)*	0.00954 (−0.00739, 0.0263)
Probiotic-exposed: Postmenstrual age	−0.505 (−1.35, 0.337)	−0.00169 (−0.0371, 0.0324)
Percent days on antibiotics	−0.254 (−0.870, 0.365)	−0.00759 (−0.0304, 0.0157)

^†Comparison of probiotic-exposed preterm infants to unexposed preterm infants. *p < 0.05. **p < 0.01. ***p < 0.001.