Table 1. Characteristics of the hearing-impaired children (cases) and normal-hearing children (controls).
| Continuous variables | Hearing-impaired subjects (cases) | Normal-hearing subjects (controls) | ||
|---|---|---|---|---|
| Mean | Standard deviation | Mean | Standard deviation | |
| Age (years) | 8.2 | 1.6 | 8.2 | 1.6 |
| Years of study | 4.8 | 1.4 | 4.8 | 1.4 |
| Mother’s schooling | 10.9 | 4.3 | 10.9 | 4.3 |
| Dichotomous variables | Hearing-impaired subjects (cases) | Normal-hearing subjects (controls) | ||
|---|---|---|---|---|
| n | % | n | % | |
| Gender (male) | 10 | 47.6 | 10 | 47.6 |
| School type (private) | 12 | 57.1 | 12 | 57.1 |