Statistical Analysis
death, NDI
REGRESSION, MAY
Analyses occurred between October 2020 and May 2022. The difference in each outcome between Hgb threshold groups was examined using mixed-effects modeling performed on transfusion-level data using a random intercepts model while adjusting for age at transfusion, gestational age, birth weight stratum,Classification and regression tree (CART) analysis was used to explore infant-level prognostic factors for death or NDI over the entire hospitalization period. Variables offered to the CART procedure are listed in eTable 2 in To validate results of CART, a stepwise logistic regression was performed, offering similar infant-level variables (eTable 2 in 