| Value | Category |
|---|---|
| 1 | Less than 1 month |
| 2 | From 1 to less than 3 months |
| 3 | From 3 to less than 6 months |
| 4 | From 6 months to less than 1 year |
| 5 | From 1 year to less than 1 year and a half |
| 6 | From 1 year and a half to less than 2 years |
| 7 | From 2 to less than 4 years |
| 8 | 4 years old or older |
| 9 | NIU (not in universe) |
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