Education level | Never or almost never | 1–3 times/month | 1 time/week | 2–6 times/week | 1 time/day | ≥2 times/day | P * |
---|---|---|---|---|---|---|---|
Illiteracy | 28 | 6 | 4 | 42 | 55 | 13 | <0.001 |
Primary school | 18 | 7 | 9 | 57 | 133 | 33 | |
Middle school | 6 | 4 | 11 | 43 | 213 | 118 | |
High school or above | 7 | 1 | 5 | 15 | 212 | 148 |