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Table 1 Descriptive statistics of the contrast threshold (Michelson contrast): The median and the inter-quartile range of the threshold is shown for each flicker frequency and for both groups. The last three columns show the results of the unpaired t-test of the log10 (contrast threshold) between patients and controls. Significant differences are marked in bold

From: Age- and frequency-dependent changes in dynamic contrast perception in visual snow syndrome

Freq. [Hz]

Group

Contrast threshold (MC)

Degree of freedom

t-value

p-value

median [iqr] * 100

15

controls

0.77 [0.61]

38

−2.83

0.0074

patients

1.17 [0.51]

20

controls

1.68 [1.19]

37

−1.31

0.1999

patients

1.99 [0.69]

25

controls

2.71 [1.85]

38

−1.03

0.3088

patients

3.10 [1.30]

30

controls

6.08 [3.75]

38

−0.16

0.8739

patients

6.21 [3.09]

35

controls

7.60 [5.48]

37

−1.35

0.1841

patients

9.12 [3.34]

40

controls

9.29 [5.55]

38

−1.81

0.0783

patients

11.36 [3.64]