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Table 1 Distribution of participants. “/”: missing data

From: Prevalence of reduced visual acuity among school-aged children and adolescents in 6 districts of Changsha city: a population-based survey

 

Furong

Tianxin

Wangcheng

Kaifu

Yuhua

Yuelu

Total

n

%

n

%

n

%

n

%

n

%

n

%

Primary Grade 1

92

3.83%

134

4.41%

1905

19.54%

70.84

15.15%

12,937

15.36%

16,302

15.54%

38,454

Primary Grade 2

71

2.96%

86

2.83%

1985

20.36%

6720

14.39%

12,083

14.35%

14,497

13.82%

35,442

Primary Grade 3

94

3.92%

139

4.58%

1497

15.36%

6151

13.17%

11,285

13.41%

12,873

12.27%

32,039

Primary Grade 4

92

3.83%

85

2.81%

933

9.57%

5390

11.54%

10,746

12.77%

11,844

11.29%

29,090

Primary Grade 5

113

4.71%

157

5.17%

1084

11.12%

5586

11.96%

9704

11.53%

11,310

10.78%

27,954

Primary Grade 6

109

4.54%

72

2.37%

1060

10.87%

4923

10.54%

7835

9.31%

10,030

9.56%

24,029

Secondary Grade 1

758

31.56%

1101

36.25%

704

7.22%

4301

9.21%

7041

8.37%

9302

8.87%

23,207

Secondary Grade 2

564

23.49%

872

28.71%

581

5.96%

3841

8.22%

5466

6.49%

8218

7.83%

19,542

Secondary Grade 3

/

/

/

/

/

/

1858

3.98%

798

0.95%

3562

3.40%

6218

High Grade 1

508

21.16%

198

6.52%

/

/

514

1.10%

3577

4.25%

3112

2.97%

7909

High Grade 2

/

/

193

6.35%

/

/

229

0.49%

2699

3.21%

2998

2.86%

6119

High Grade 3

/

/

/

/

/

/

116

0.25%

/

/

861

0.82%

977

Total

2401

100%

3037

100%

9749

100%

46,713

100%

84,171

100%

104,909

100%

250,980