Variable selection and descriptions
| Variable | Description |
| Dependent variable | |
| Rehabilitation effect | 0=Good rehabilitation effect, 1=Poor rehabilitation effect |
| Independent variables | |
| Micro-level individual factors | |
| Gender | 1=Male, 2=Female |
| Personality | 1=Active, 2=Impulsive, 3=Calm and introverted, 4=Sentimental |
| Age at evaluation | 1 = <3 years old，2=3–6 years old，3= >6 years old |
| Age at cochlear implantation | 1= <3 years old，2=3–6 years old，3= >6 years old |
| Duration between initial evaluation and implantation | 1= <1 year, 2=1–3 years, 3= >3 years |
| Preoperative hearing aids | 1=Yes, 2=No |
| Daily cochlear implant use (hours) | 1= <8 hours, 2=8–16 hours, 3= >16 hours |
| Medium family factors | |
| Family monthly income | 1= <5 thousands, 2=5–10 thousands, 3= >10 thousands |
| Number of children at home | 1=One, 2=Two, 3=Three or more |
| Family history of deaf–mute | 1=Yes, 2=No |
| Postoperative rehabilitation model | 1=Family rehabilitation education, 2=Institution rehabilitation education, 3=Family and institution rehabilitation education |
| Cochlear origin | 1=China, 2=Austria, 3=America，4=Australia, 5=Other |
| Macro-level policy factors | |
| Payment method for surgery | 1=National project reimbursement，2=Partial fund subsidy, 3=Self-paying |