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Table 6 mfERG Values in Patients and Control Group

From: Long-term visual pathway alterations after elemental mercury poisoning: report of a series of 29 cases

Amplitude

P1/N1ratio

Ring

Eye

All patients

Control

values

p-value

95%CI

Group 1a

Control

values

p-value

95%CI

Ring 1

RE

380 ± 209.6

528 ± 104,7

0.0334

[12.35 to 283.7]

298.6 ± 137.4

528 ± 104,7

0.0003

[120.8 to 338.0]

LE

278.4 ± 100.1

< 0.0001

[175.5 to 323.7]

182.0 ± 64.13

< 0.0001

[268.8 to 423.2]

Ring 2

RE

124 ± 39.30

122.8 ± 12.69

0.9222

89.99 ± 29.32

122.8 ± 12.69

0.0028

[12.72 to 52.90]

LE

123.2 ± 42.59

0.9760

81.45 ± 27.35

0.0002

[22.39 to 60.31]

Ring 3

RE

42.35 ± 10.95

56.47 ± 6.81

0.3031

32.55 ± 7.470

56.47 ± 6.81

< 0.0001

[18.56 to 31.28]

LE

43.74 ± 10.10

0.3503

34.43 ± 6.273

< 0.0001

[17.21 to 28.87]

Ring 4

RE

43.01 ± 12.77

35.85 ± 4.72

0.4736

31.11 ± 8.031

35.85 ± 4.72

0.1070

LE

43.06 ± 11.62

0.4646

32.08 ± 8.246

0.2031

Ring 5

RE

12.36 ± 3.20

19.76 ± 1.21

< 0.0001

[5.370 to 9.430]

9.479 ± 1.489

19.76 ± 1.21

< 0.0001

[9.074 to 11.49]

LE

12.5 ± 3.0

< 0.0001

[5.349 to 9.171]

9.802 ± 1.929

< 0.0001

[8.526 to 11.39]

  1. Data are presented as mean ± SD or as numbers. Amplitude P1/N1 ratio (nV/deg2). Ring 1 = < 2°; ring 2 = 2–5°; ring 3 = 5°–10°; ring 4 = 10°–15°; and ring 5 = > 15, RE right eye, LE left eye, CI confidence interval
  2. aGroup 1 is a subgroup of patients with evident visual disturbances in their visual field test. Patients with concentric constriction (17 eyes) and hemi-field defects (5 eyes) patterns