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Table 1 Prevalence of myopia among Inner Mongolia Medical University students in relation to various parameters

From: Prevalence of and Factors Associated with Myopia in Inner Mongolia Medical Students in China, a cross-sectional study

Variable

N = 11,138

n = 7814

prevalence

χ2

P

Basic Information

 Sex

   

77.91

0.000

 female

7980

5792

72.58

  

 male

3149

2018

64.08

  

 Area

   

76.89

0.000

 Rural

6877

4622

67.21

  

 Urban

4239

3181

75.04

  

 Year of study

   

7.35

0.118

 1

4276

2990

69.93

  

 2

3935

2755

70.01

  

 3

2260

1615

71.46

  

 4

513

361

70.37

  

 5

142

87

61.27

  

Genetic factors

 Family members’ myopia statuses

 

18.23

0.000

 both parents

245

221

90.20

  

 one parent

1448

1138

78.59

  

 no parent

9445

6455

68.34

  

Environmental factors

 Often see green

   

0.73

0.390

 No

4221

368

8.72

  

 Yes

6915

636

9.20

  

 Perform eye exercises

   

74.83

0.000

 Insist on performing

325

181

55.69

  

 Sometimes

3581

2399

66.99

  

 Rarely

6522

4755

72.91

  

 Will not perform

699

475

67.95

  

 Eye drops

   

38.66

0.000

 No

5993

4055

67.66

  

 Yes

5143

3758

73.07

  

 People around them stay up late

 

4.15

0.042

 No

6957

4833

69.47

  

 Yes

4177

2978

71.30

  

 Inadequate diet

   

8.67

0.003

 No

4748

3261

68.68

  

 Yes

6382

4548

71.26

  

 Take a break after reading 1 h

 

165.41

0.000

 No

8722

6375

73.09

  

 Yes

2416

1439

59.56

  

 Use a lamp

   

103.54

0.000

 No

2224

1364

61.33

  

 Yes

8913

6450

72.37

  

 Habit of staying up late

  

30.95

0.000

 No

5330

3607

67.67

  

 Yes

5797

4203

72.50

  

 Stay up late for homework

  

9.61

0.002

 No

5398

3712

68.77

  

 Yes

5735

4098

71.46

  

 Stay up late for study section review

1.67

0.195

 No

7869

5492

69.79

  

 Yes

3265

2319

71.03

  

 Stay up late because of pressure to study

 

0.81

0.370

 No

6023

4717

78.32

  

 Yes

5111

3640

71.22

  

 Search for information online

  

17.01

0.000

 No

3200

2155

67.34

  

 Yes

7936

5658

71.30

  

 When they started using a computer

 

3.48

0.180

 Primary school

1118

804

71.91

  

 High school

5470

3860

70.57

  

 University

4532

3143

69.35

  

 Frequency of computer use

  

3.1

0.380

 Every day

3359

2344

69.78

  

 2–4 times a week

4025

2814

69.91

  

 1 time per week

2206

1544

69.99

  

 Almost none

1537

1108

72.09

  

 Computer use per day

 

4.17

0.125

 Less than 1 h

3270

2338

71.50

  

 1–3 h

6098

4259

69.84

  

 More than 3 h

1753

1210

69.02

  

 Bedtime

   

31.04

0.000

 Before 10:00

283

157

55.48

  

 10:00–12:00

8156

5776

70.82

  

 After 12:00

1961

1367

69.71

  

 No rule

730

511

70.00

  

 Read for long durations

  

1586.92

0.000

 No

5906

3250

55.03

  

 Yes

5086

4557

89.60

  

 Read while lying down

   

9.26

0.002

 No

2246

1517

67.54

  

 Yes

8886

6294

70.83

  

 Read under dim light

  

3.84

0.050

 No

2374

1627

68.53

  

 Yes

8758

6184

70.61

  

 Depression

   

8.32

0.004

 No

5270

3628

68.84

  

 Yes

5860

4181

71.35

  

 Eye rubbing

   

19.04

0.000

 No

2752

1840

66.86

  

 Yes

8379

5970

71.25