| Value | Category |
|---|---|
| -9 | don't know |
| -8 | refused to answer |
| -7 | not applicable |
| -6 | still in process |
| -5 | application denied |
| -4 | skipped |
| -3 | not provided |
| 1 | are taken directly from establishments’ records |
| 2 | are estimates computed with some precision |
| 3 | are arbitrary and unreliable numbers |