Research Article
PERCEPT Indoor Navigation System for the Blind and Visually Impaired: Architecture and Experimentation
Table 2
Population for Phase II trials.
| Field | Response | Number of subjects |
| Gender | Male | 8 | Female | 12 |
| Race | African American | 3 | Caucasian | 12 | Hispanic | 5 |
| Age (in years ) | age < 20 | 2 | 20 age < 30 | 2 | 30 age < 40 | 2 | 40 age < 50 | 2 | 50 age < 60 | 9 | 60 age < 70 | 2 | 80 age < 90 | 1 |
| Level of blindness | Blind | 9 | Partial vision | 11 |
| Received O&M training | Yes | 19 | No | 1 |
| Members in household | 1 | 5 | 2 | 9 | 3 | 3 | 4 | 1 | >5 | 2 |
| Highest education level | GED | 2 | High school | 1 | Some college | 6 | Undergraduate degree | 9 | Masters degree | 2 |
| Blind since birth | Yes | 5 | No | 15 |
| Navigation aid | Cane | 10 | Guide dog | 7 | No mobility aid | 3 |
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