This article was based on the long term follow-up study to explore the delay developments (MDI & PDI) of very low birth weight infants (VLBWs, birth weight <1500g) in different followed corrected age. Of all, there were 658 samples enrolled in the studying period (Jan, 2001 to Dec, 2006), and rendered various characteristics and variables to be analyzed and described (by chi-squared test, independent sample t test, person correlation analysis, and logistical regression). The results as followed, the probability of serious complications in the group of extremely low birth weight infants (EVBWs) is higher than the VLBWs’
(related risk is 1.05); the lower birth weight and gestation age are two positive correlated co-factor in both of delay MDI and PDI, and the negative co-factor is longer stay of in-hospital. Otherwise, the lower
educational degree of cases’ mother is an independent factor in poor MDI. In order to the relationship of serious complications and the delay MDI and PDI development of these cases, the co-factors in theperiod of 24-month corrected age are PVL, severe IVH and ROP; CLD for the delay MDI, and sepsis & PDA for the delay PDI are the individual factors, respectively; in the part of continuous delay conditions in MDI, or PDI, or both in the period of 12 to 24-month of corrected age, the co-factors are the group of extremely low birth weight (ELBWs), longer stay of in-hospital, and early delay in first 6-month of corrected age. Our findings demonstrate that the personal characteristics and the serious complications are the factors for delay developmental prognosis in the population of infants (birth weight <1500g), and the detail analysis based on further researches indeed.
