Table 3: Results of the acoustic analysis of the vowel /æ/ samples in children implanted before or at the age of 4 years (N = 15) and children implanted after the age of 4 years (N = 15).

Acoustic parameter Implanted at the Age < 4 years (mean/S.D.) Implanted at the Age > 4 years (mean/S.D.) p
f0 before CI 303.73/75.69 288.19/67.53 0.550
f0 6 months after CI 317.77/43.07 288.19/67.53 0.018
f0 12 months after CI 311.85/70.08 288.19/67.53 0.008
f0 24 months after CI 315.07/49.69 270.58/85.73 0.112
JIT before CI 3.91/1.64 1.17/0.62 0.000
JIT 6 months after CI 2.01/1.47 1.33/0.95 0.266
JIT 12 months after CI 2.01/1.47 1.33/1.11 0.439
JIT "24 months" after CI 0.88/0.53 0.89/0.54 0.962
SH before CI 0.88/0.53 3.49/1.24 0.000
SH 6 months after CI 4.89/1.98 3.65/1.25 0.113
SH 12 months after CI 4.89/1.98 3.24/1.43 0.024
SH "24 months" after CI 3.23/1.51 2.89/0.81 0.530
NHR before CI 0.23/0.12 0.11/0.02 0.530
NHR 6 months after CI 0.23/0.29 0.12/0.01 0.530
NHR 12 months after CI 0.15/0.04 0.13/0.04 0.188
NHR "24 months" after CI 0.11/0.01 0.11/0.02 0.297