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Table 4 CVS symptoms and correlation with the device used

From: Prevalence rate of attention deficit hyperactivity disorder (ADHD) and computer vision syndrome (CVS) symptoms predisposition among digital device users of Bangladesh

CVS symptoms

Device use time

1–3 h

4–6 h

 > 6 h

Correlation coefficient

N

Percentage (%)

N

Percentage (%)

N

Percentage (%)

Dry eyes

 No effect

40

20

21

15

30

11

0.263**

 Mild

15

8

13

7

26

13

 Moderate

3

2

20

10

26

13

 Severe

1

1

1

1

1

1

Red and Irritated eyes

 No effect

35

18

18

9

23

12

0.279**

 Mild

18

9

14

7

28

14

 Moderate

4

2

16

8

22

11

 Severe

2

1

7

4

10

5

Neck and Shoulder pain

 No effect

35

18

11

6

16

8

0.339**

 Mild

13

7

19

10

26

13

 Moderate

10

5

18

9

28

14

 Severe

1

1

7

4

13

7

Headache

 No effect

3

18

13

7

23

12

0.248**

 Mild

13

7

25

13

30

15

 Moderate

9

5

12

6

19

10

 Severe

2

1

5

3

11

6

Eye strain and feeling tired

 No effect

41

21

6

3

16

8

0.400**

 Mild

10

5

26

13

24

12

 Moderate

6

3

17

9

35

18

 Severe

2

1

6

3

8

4

Blurred vision

 No effect

32

16

15

8

22

11

0.238**a

 Mild

31

12

34

24

47

16

 Moderate

3

2

8

4

12

6

 Severe

0

0

2

1

1

1

  1. a,**Correlation coefficient for the Pearson-spearman significance at the p = 0.01(2-tail)