Variable | Mean | Sd | Max | Min |
---|---|---|---|---|
Vision exam ( 1 = Yes, 0 = No) | 0.18 | 0.38 | 1.00 | 0.00 |
Eyeglasses ownership ( 1 = Yes, 0 = No) | 0.04 | 0.20 | 1.00 | 0.00 |
Visual impairment (1 = Yes, 0 = No) | 0.25 | 0.43 | 1.00 | 0.00 |
Gender (1 = female, 0 = male) | 0.48 | 0.50 | 1.00 | 0.00 |
Student is the only child in the family (1 = Yes, 0 = No) | 0.10 | 0.30 | 1.00 | 0.00 |
Student is the youngest child in the family (1 = Yes, 0 = No) | 0.39 | 0.49 | 1.00 | 0.00 |
Student is the oldest child in the family (1 = Yes, 0 = No) | 0.34 | 0.47 | 1.00 | 0.00 |
Student is the middle child in the family (1 = Yes, 0 = No) | 0.18 | 0.38 | 1.00 | 0.00 |
LogMAR | 0.21 | 0.28 | 1.60 | -0.20 |
Age (Years) | 10.55 | 1.14 | 15.00 | 8.00 |
Math score | 0.02 | 0.99 | 2.56 | -2.99 |
Both parents have an education level above high school (1 = Yes, 0 = No) | 0.18 | 0.38 | 1.00 | 0.00 |
Left behind children (1 = Yes, 0 = No) | 0.12 | 0.33 | 1.00 | 0.00 |
Household assets are in the bottom 25%(1 = Yes, 0 = No) | 0.25 | 0.43 | 1.00 | 0.00 |
Location (1 = Gansu, 0 = Shaanxi) | 0.52 | 0.50 | 1.00 | 0.00 |