There was a higher occurrence of central abnormality for grade II, III and IV PIVH children, as compared to the degree I, statistically significant (Table 3).
In the three-year period studied, the occurrence of PIVH in premature infants was 6.4%, similar to the data obtained in previous national study, which found 5%.
However, literature has been signalling a decrease in the occurrence of PIVH in children with very low birthweight, from 50.9% in 1991 to 11.9% in 2005,  for the Brazilian population, the study noted significant reduction in PIVH during the four years analyzed.
PIVH is a common complication in premature, especially those with very low birthweight, and it may lead to important consequences, among them, peripheral and central auditory disorders, including auditory processing disorders that interfere with language development, school learning and subsequent social performance.
In this study there was a higher occurrence of central hearing loss for the group with PIVH, reinforcing previous research findings.
In this study there was a higher incidence of grade I PIVH, which presents a better prognosis, with chance of resorption.
Indeed, previous study found a statistically significant correlation between weight and the occurrence of PIVH, being proportional to lowest average weight, a fact that led the authors to conclude that the PIVH is a frequent event and can be associated to a birthweight inferior ton 1500g.
However, because of poor adherence (drop-out rate of 45.2% in the SG), monitoring of PIVH patients was impaired, even considering that 15% had presented central hearing loss at birth.
According to the literature, a difficulty for sound localization has been observed both for premature infants without PIVH8-14 and in preterm infants with PIVH .
In fact, another study also found delay sound localization in premature infants treated in neonatal intensive care unit, without specifying the presence of PIVH. 
[8,14] Zanchetta, (1997)  found a lower incidence of responses to pure tones in children with PIVH. This result was similar to what was found in the present study, in which seven children (26%) with PIVH presented alterations in their VRAs, while only one child (4.8%) without PIVH had such difficulty.
Such ability was compromised in more than half of children with PIVH (52.2%), although the statistical analysis could not be considered significant, probably due to the restrictive sample.