| Value | Category | 
|---|---|
| 1 | Answering machine/service | 
| 2 | Contact (no resistance)- general callback | 
| 3 | Contact (resistance) by R- Initial refusal by R | 
| 4 | Appointment set | 
| 5 | Tracking in progress | 
| 6 | Contact- resistance/refusal not by R but by someone else | 
| 7 | Not contact- no answer, busy signal, dead tone, buzz | 
| 8 | |
| 10 | |
| 11 | |
| 12 | |
| 14 | |
| 15 | |
| 23 | |
| Sysmiss |