Table 2 Flicker ERG amplitudes and peak times of 80 preterm infants.

From: Flicker electroretinogram in preterm infants

Stimulus level (cd•s/m2)

Group A (GA: 34 0/7 to 36 6/7 weeks)

Group B (GA: ≤ 31 weeks)

n ERG* (%)

median

IQR

CQD

n ERG* (%)

median

IQR

CQD

Peak time (ms)

3

16 (40)

44.3

13.3

0.14

26 (65)

44.8

11

0.13

6

24 (60)

44.0

5.4

0.06

21 (53)

46.6

7.7

0.09

12

33 (83)

45.6

11

0.13

28 (70)

46.1

4.4

0.05

30

35 (88)

43.5

6.1

0.07

34 (85)

42.0

8.8

0.11

50

32 (80)

43.0

3.9

0.05

31 (78)

41.0

13.8

0.18

Amplitude† (µV)

3

16 (40)

0.66

0.48

0.40

26 (65)

0.90

0.88

0.44

6

24 (60)

0.93

0.58

0.33

21 (53)

1.17

0.82

0.39

12

33 (83)

1.10

0.91

0.45

28 (70)

1.31

1.29

0.48

30

35 (88)

1.47

1.44

0.49

34 (85)

1.61

1.31

0.36

50

32 (80)

1.55

1.63

0.43

31 (78)

3.01

2.33

0.38

  1. *Number of infants with reproducible ERG waveforms in group A (n = 40) and group B (n = 40).
  2. † Peak-to-peak amplitude of the flicker waveform.
  3. CQD coefficient of quartile deviation, GA gestational age, IQR interquartile range.
Back to article page