2.4.2. Secondary Outcomes 
NEC, pneumonia, ROP, IVH, shock, ileus, hemorrhagic, vomiting of bile until pathological causes, BPD, sepsis, PVL
PNEUMONIA, BRONCHOPULMONARY DYSPLASIA (BPD), INTESTINAL OBSTRUCTION, SHOCK, ILEUS, INTRAVENTRICULAR HEMORRHAGE, PERIVENTRICULAR LEUKOMALACIA, SEPSIS, RETINOPATHY OF PREMATURITY
Growth (weight, length, and head circumference) was assessed at discharge and four months of corrected age.Feeding tolerance under the whole fortification period. Morbidity: Incidence of NEC, retinopathy of prematurity (ROP), bronchopulmonary dysplasia (BPD), intraventricular hemorrhage (IVH), periventricular leukomalacia (PVL), sepsis, and pneumonia. The definitions are as follows:The outcomes are defined as
Feeding tolerance was defined as hemorrhagic residuals or vomiting of bile until pathological causes were ruled out (intestinal obstruction or ileus) [NEC: Stage II or III. Stage II requires clinical manifestations of a distended abdomen and radiological verification (intramural or portal gases). Stage III requires findings like in Stage II and more severe clinical symptoms (shock, need for a respirator). In surgically verified cases, radiological verification is not required [ROP: Stages I to V, diagnosed by an ophthalmologist according to international criteria [BPD: Need for oxygen, continuous positive airway pressure (CPAP,) or mechanical ventilation at 36+0 weeks of gestational age [IVH as defined by Volpe [PVL as defined by Volpe [Early- and late-onset sepsis was defined as positive blood or cerebral fluid culture at less and more than 72 h of age, respectively [The schedule of enrolment, interventions (including any run-ins and washouts), assessments, and visits for participants are presented in 