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Table 1 Student characteristics N = 19934

From: Gender differences in vision health-seeking behavior and vision health outcomes among rural Chinese schoolchildren by birth order and family size

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