3.2The auditory perception outcomes
An improvement was observed in comparing Ling’s sound test scores with
the first evaluation period postoperative scores (Table 2). There was a
significant difference between preoperative and postoperative in all
children with IP-I (F1-71 = 16.056, p -value
< .005), cochlear hypoplasia (F1-51 =
18.769, p -value < .005) and common
cavity(F1-15 = 76.164, p -value < .005).
There were no preoperative and postoperative statistical differences
compared to children with other IEMs.
The comparison of the preoperative MAIS scores and the one-six months
and one-three years’ postoperative scores showed that auditory
integration improved significantly (Table 3), and all children with IEMs
benefitted from CI (Figure 1). Also, there were remarkable differences
between the MAIS scores of the different malformation groups in three
years after surgery. A comparison of the MAIS scores of children with
common cavity showed statistical difference at all periods
(F1-15 =10.186, p -value < .005), but
their rate of development was so slow than children with IEMs and normal
cochlea.Also, children with (IP-I F1-71 =
16.056, p -value < .005) and cochlear hypoplasia
(F1-51= 18.769, p -value < .005) showed
a significant difference between preoperative and postoperative in MAIS
scores.
Table 4 and Figure 2 presented results of closed-set PPT and open-set
SRT. All children with normal cochlea completed the closed-set and
open-set tests in second evaluation period with relative success.
However, children with IP-I, cochlear hypoplasia, common cavityand
dilatation of vestibulehad not yet reached the open set SRT test within
one-three years.Children with different IEMs also achieved very low
scores, except EVA (F1-27 = .955, p -value = .337;
F1-27 = 1.050, p -value = .315), IP-II
(F1-79 = .071, p -value = .791;
F1-79 = .062, p -value = .804) and IP-III
(F1-19 = 1.991, p -value = .175;
F1-19 = .188, p -value = .670)patients. A
comparison of the PPT and SRT scores of children with IP-I
(F1-71 = 25.262, p -value < .005;
F1-71 = 47.216, p -value < .005),
cochlear hypoplasia (F1-51 = 33.196, p -value
< .005; F1-51 = 31.908, p -value
< .005)common cavity(F1-15=33.286, p -value < .005; F1-15=30.621, p -value < .005) and dilatation of vestibule
(F1-5 = 11.172, p -value < .005;
F1-5 = 16.000, p -value < .005)showed
statistical difference.
Enlarged vestibular aqueduct obtained the first group of children with
the highest scores in terms of auditory perception performance among
IEMs. The children with EVA achieved open set SRT approximately 80%.
Unfortunately, children with common cavity constituted the lowest score
group for auditory perception results. In the Ling’s Sound Test and MAIS
evaluation performed before the CI, in common cavity had the lowest
scores compared within the normal cochlea, and statistically significant
differences were found (p -value < .005). In the MAIS
test, between second evaluation periods after CI, in common cavity had a
score of 25.38 points while in normal cochlea had a score of 40 full
points. Although they could only complete the closed-set PPT, they were
unable to open-set SRT.