| Value | Category | Cases | |
|---|---|---|---|
| 0 | I do not take extra tuition | 43445 |
70.8%
|
| 1 | Once a month | 1615 |
2.6%
|
| 2 | 2 or 3 times per month | 2236 |
3.6%
|
| 3 | Once or twice per week | 3399 |
5.5%
|
| 4 | 3 or more times per week | 10701 |
17.4%
|