Apnea in Hospitalized Preterm Infants Following the Administration of Routine Childhood Vaccines

Modified Intent-to-Treat (mITT) Analysis Population: Defined as any infant that was enrolled and randomized in the study For the mITT analysis, infants will be analyzed in their assigned treatment arms irrespective of receipt of vaccine. Study outcomes will be included in the analysis as follows: i) Vaccinated group: study outcomes in the 48-hour monitoring after vaccination. If vaccination does not occur by 12 hours after randomization, then study outcomes will be assessed between 12 and 60 hours after randomization. ii) Unvaccinated group: study outcomes in the 48-hour monitoring period after randomization.