Table 6 Multivariate linear regression of audiological profile score (postoperative)

Age of hearing loss (month)

27.4 ± (4.8)

0.16 (0.03 to 0.30, p = 0.017*)

0.04 (− 0.18 to 0.27, p = 0.683)

Cause of hearing loss

 Meningitis

22.5 ± (3.5)

-

-

 Otitis media

20.0 ± (NA)

 − 2.50 (− 13.84 to 8.84, p = 0.656)

 − 5.01 (− 16.45 to 6.43, p = 0.372)

 Unknown

28.0 ± (4.6)

5.50 (− 1.26 to 12.26, p = 0.107)

0.62 (− 7.40 to 8.63, p = 0.874)

Age of hearing aids fitting (months)

27.7 ± (4.7)

 − 0.01 (− 0.31 to 0.29, p = 0.937)

 − 0.01 (− 0.31 to 0.29, p = 0.937)

Duration of hearing deprivation till hearing aids (month)

27.4 ± (4.8)

 − 0.32 (− 0.66 to 0.02, p = 0.062)

 − 0.21 (− 0.60 to 0.19, p = 0.285)

Duration of hearing depravation from hearing loss till CI (year)

27.4 ± (4.8)

0.22 (− 0.64 to 1.09, p = 0.600)

 − 0.53 (− 1.52 to 0.46, p = 0.279)

Duration of rehabilitation in years (pre-operative)

27.7 ± (4.7)

0.10 (− 0.52 to 0.72, p = 0.739)

0.10 (− 0.52 to 0.72, p = 0.739)

Age of operation cochlear implantation CI (year)

27.4 ± (4.8)

1.58 (0.67 to 2.50, p = 0.001*)

1.09 (− 0.82 to 2.99, p = 0.249)

Implant brand

 Cochlear

27.3 ± (4.5)

-

-

 MED-EL

27.4 ± (5.1)

0.12 (− 4.24 to 4.48, p = 0.954)

0.37 (− 4.42 to 5.16, p = 0.874)

 Oticon

29.3 ± (4.0)

2.05 (− 4.88 to 8.98, p = 0.550)

 − 0.79 (− 7.96 to 6.38, p = 0.821)

Site of insertion

 Boney cochleostomy

28.6 ± (4.1)

-

-

 Extended round window

29.3 ± (5.2)

0.76 (− 3.04 to 4.56, p = 0.685)

0.10 (− 4.31 to 4.51, p = 0.962)

 Round window

24.1 ± (3.8)

 − 4.47 (− 8.15 to − 0.79, p = 0.019*)

 − 2.44 (− 7.74 to 2.85, p = 0.348)

Parents’ involvement

 Negative

26.6 ± (4.6)

-

-

 Positive

27.7 ± (4.9)

1.05 (− 2.95 to 5.06, p = 0.595)

2.66 (− 1.75 to 7.07, p = 0.223)