DED

Frequency

Percentage

Mean SD

CI

p-value

Normal (>15 mm)

530

72.6

15.4 ± 0.36

15.0 to 15.2

0.000

Mild (9 - 14 mm)

134

18.4

10.6 ± 0.89

10.1 to 10.7

0.000

Moderate (4 - 8 mm)

50

6.8

5.7 ± 1.5

5.5 to 7.6

0.000

Severe (<4 mm)

16

2.2

3.3 ± 0.4

3.0 to 3.8

0.000

Total

730

100