Table 5.

Univariate and multivariate analysis of SIR score.

Parameters	Univariate analysis			Multivariate analysis
	SIR	t	P value	OR	95% CI	P value
Gender		0.222	0.825
Male	2.40 ± 0.81
Female	2.36 ± 0.77
Implant age		4.303	0.001	1.76	1.06–8.77	0.002
Less than 5	2.01 ± 0.64
More than 5	2.73 ± 0.82
Parents' education level		4.533	0.001	1.25	1.15–9.22	0.004
Low level	1.96 ± 0.62
High level	2.77 ± 0.84
Dominant hand		0.114	0.910
Left	2.37 ± 0.77
Right	2.39 ± 0.80
Implant ear		0.230	0.819
Left	2.40 ± 0.82
Right	2.36 ± 0.73
Family income		5.373	0.001	2.37	1.33–6.29	0.007
Low	1.92 ± 0.60
High	2.81 ± 0.85