Statistical analysis
Statistical analyses were performed with SPSS 13.0. Bivariate
and multivariate logistic regression was performed
to identify potential perinatal risk factors
associated with adverse outcome. Variables with p <0.2
in the bivariate analysis were entered into a backward
stepwise multivariate regression model. Model fit was
assessed with the Hosmer-Lemeshow goodness-of-fit test.
A non-significant value for the Hosmer-Lemeshow Chisquare
test suggests an absence of biased fit. Analysis of
the area under the curve (AUC) of the Receiver Operating
Characteristic (ROC) curve was constructed to assess the
prognostic performance. The nonparametric method of
Delong was used to compare significant difference between
AUCs (Sigmaplot 10.0 software). Sensitivity and
specificity were also determined. All probability values are
two-sided. Differences with p values <0.05 were considered
to be statistically significant.
Results
A total of 160 infants were included in this study. During
the time period of the study, 207 preterm infants with less
than 33 gestational weeks were admitted to NICU during
the first day of life. Forty-seven infants were excluded: 2
were diagnosed with severe congenital anomalies, 1 was
transferred to another department, and 44 were unexpectedly
discharged because of economic reasons.
Of the total 160 preterm infants, 17 died before the
time of BPD screening. Among the 143 survived infants,
41 fulfilled the criteria for the diagnosis of BPD,
including 25 with mild, 9 with moderate, and 7 with severe
BPD. Patient characteristics of survivors without
BPD and infants who died or developed BPD are shown
in Table 1. In addition, there was no significant difference
between included and excluded preterm infants
with regards to gestational age (31.00 [25.86-32.86] vs
30.86 [24.00-32.86] weeks, p =0.797), birth weight
(1460 [670–2320] vs 1550 [850–2300] g, p =0.285),
gender (male/female: 104/56 vs 30/14, p =0.724), SNAP
(10 [3-27] vs 9 [3-16], p =0.146), 1 min-Apgar score ( 8
[1-10] vs 8 [5-10], p =0.841), 5 min-Apgar score (9 [2-
10] vs 8.5 [6-10], p =0.476), and oxygen therapy during
the first 72 hours (p >0.05).
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