| Value | Category |
|---|---|
| 01 | Less than 1 month |
| 02 | From one to less than 4 months |
| 03 | From 4 to less than 7 months |
| 04 | From 7 months to less than 1 year |
| 05 | From 1 year to less than 2 years |
| 06 | From 2 years to less than 3 years |
| 07 | Three or more years |
| 98 | Do not know |
| 99 | NIU (not in universe) |
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