Data collection
TB, sepsis, ROP, NRDS, IVH, primary diseases, MBDP, PNAC, weight loss, TG, PVL
SEPSIS, BRONCHOPULMONARY DYSPLASIA (BPD), GESTATIONAL DIABETES MELLITUS, NEONATAL RESPIRATORY DISTRESS SYNDROME, PREGNANCY COMPLICATIONS, INTRAVENTRICULAR HEMORRHAGE, GROWTH RETARDATION, GESTATIONAL HYPERTENSION, SECONDARY, PERIVENTRICULAR LEUKOMALACIA, METABOLIC BONE DISEASE OF PREMATURITY, COMPLICATIONS, RETINOPATHY OF PREMATURITY
According to the unified questionnaire, the following data were collected: the primary observation index was the incidence of PNAC, and the secondary observation index was blood biochemical indicators: total bilirubin (TB), direct bilirubin (DB), alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), triglyceride (TG), cholesterol (CHOL), serum calcium (Ca), serum phosphorus (P); and early complications related to premature infants were as follows: patent ductus arteriosus (PDA), retinopathy of prematurity (ROP), bronchopulmonary dysplasia (BPD), intraventricular hemorrhage (IVH), periventricular leukomalacia (PVL), feeding intolerance (FI), extrauterine growth retardation (EUGR), LOS, and metabolic bone disease of prematurity (MBDP) were observed. In addition, the general information and perinatal data of the two groups were collected and included GA, BW, gender, 5 min Apgar score, mode of delivery, small for gestational age (SGA), maternal pregnancy complications (gestational hypertension and gestational diabetes mellitus); primary diseases (neonatal respiratory distress syndrome [NRDS] and early-onset sepsis [EOS]) were observed at admission; nutritional status of the two groups during hospitalization: use of amino acids, fat emulsion, PN time, time of starting enteral feeding, time of reaching the whole intestinal feeding, age of reaching the standard of a total caloric, weight growth velocity (GV), days to regain birth weight, maximum physiological weight loss (%), and total hospitalization time (d); and major treatment measures, including mechanical ventilation time (d), non-invasive auxiliary ventilation time (d), and total oxygen consumption time (d).