| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 124 |
20.7%
|
| 1 | 1 year | 68 |
11.3%
|
| 2 | 2 years | 144 |
24%
|
| 3 | 3 years | 102 |
17%
|
| 4 | 4 years | 66 |
11%
|
| 5 | 5 years | 57 |
9.5%
|
| 6 | 6+ years | 20 |
3.3%
|
| 7 | Non-numeric | 9 |
1.5%
|
| 8 | Don't know | 10 |
1.7%
|