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Table 2 Characteristics of NTG patients divided into mild, moderate and severe groups

From: Ocular perfusion pressure and ophthalmic artery flow in patients with normal tension glaucoma

 

Mild

Moderate

Severe

P value

(MD < -6 dB)

(MD -6 to -12 dB)

(MD > -12 dB)

n

16 (51.6 %)

8 (25.8 %)

7 (22.6 %)

 

Mean Deviation, MD (dB)

-3.00 +/- 1.55

-8.59 +/- 2.20

-17.96 +/- 5.42

<0.001

Cup:Disc Ratio, CDR

0.69 +/- 0.11

0.75 +/- 0.09

0.80 +/- 0.08

0.076

Duration (years)

5.2 +/- 3.5

3.7 +/- 2.1

4.2 +/- 1.0

0.486

Number of medications (units)

1.3 +/- 0.4

1.6 +/- 0.5

1.9 +/- 0.9

0.072

Ocular Perfusion Pressure, OPP (mmHg)

66.00 +/- 10.78

59.06 +/- 7.42

57.29 +/- 6.62

0.096

Mean Flow Velocity, MFV (cm/s)

17.43 +/- 2.00

17.06 +/- 4.01

16.33 +/- 3.49

0.828

Peak Systolic Velocity, PSV (cm/s)

32.23 +/- 6.91

36.07 +/- 10.74

37.84 +/- 6.79

0.471

End Diastolic Velocity, EDV (cm/s)

10.03 +/- 1.32

7.55 +/- 3.57

5.57 +/- 2.94

0.027*

Resistive Index, RI

0.70 +/- 0.10

0.78 +/- 0.12

0.83 +/- 0.06

0.064

  1. Results shown as mean +/- SD. *indicates statistically significant difference between mild and severe groups