| Value | Category | 
|---|---|
| 10 | Permission granted | 
| 20 | Permission refused | 
| 21 | Parent/guardian refused | 
| 22 | Respondent refused | 
| 23 | Minor refused after parent granted | 
| 30 | Not present | 
| 31 | Respondent (or, if minor, parent) not present | 
| 32 | Minor not present | 
| 98 | Missing | 
| 99 | NIU (not in universe) | 
| var_concept.title | Vocabulary | 
|---|---|
| Male blood testing Variables -- TOPICS | IPUMS |