Table 3 Comparative statistical analysis of eye tracking parameters across the groups

From: Construction of a mild cognitive impairment prediction model for Parkinson’s disease patients on the basis of multimodal data

Task

Features

PDMCI group (n = 50)

PDNC group (n = 50)

HC group (n = 20)

p value

Single-target tracking

Average fixation duration

622 (453,820)bc

487 (405,650)a

422 (331,521)a

<0.001

Average saccade amplitude

2.49 (2.07,2.96)

2.55 (2.29,2.87)

2.58 (2.07,2.98)

0.635

Blink count, sum

15 (4,37)

17 (6,38)

25 (16,34)

0.423

Duration

8042 (7259,9172)bc

7453(7096,7841)ac

7001 (6859,7374)ab

<0.001

Fixation count

13.50 ± 4.06c

14.35 ± 3.75c

17.01 ± 4.97ab

0.007

Saccade count, sum

245 (191,314)c

269 (199,346)

296 (248,363)a

0.028

Accuracy, sum

16 (15,17)bc

18.00 (16.75,18.00)a

19 (18,20)a

<0.001

Reaction time (average)

1934 (1195,3064)c

1347 (991,1734)c

863 (741,1037)ab

<0.001

Multiple-target tracking

Average fixation duration

521 (422,630)

503 (369,680)

559 (367,797)

0.752

Average saccade amplitude

3.72 (2.85,4.80)b

4.42 (3.69,5.39)ac

3.73 (2.60,4.55)b

0.029

Blink count, sum

20 (3,58)

32 (18,71)

42 (26,60)

0.060

Duration

6915 (6517,7894)bc

6631 (6326,7049)ac

6236 (6011,6456)ab

<0.001

Fixation count

12 (11,18)

12 (10,15)

11 (8,16)

0.160

Saccade count, sum

348 (290,508)

330 (269,438)

292 (215,461)

0.164

Accuracy, sum

21.00 (19.00,21.25)bc

23 (22,26)ac

28 (27,29)ab

<0.001

Reaction time (average)

1839 (1351,2671)bc

1400 (1099,1808)ac

924 (791,1057)ab

<0.001

  1. In the comparison of the three groups, a superscript ‘a’ denotes p < 0.05 versus the PDMCI group; a superscript ‘b’ denotes p < 0.05 versus the PDNC group; and a superscript ‘c’ denotes p < 0.05 versus the HC group.
  2. PDMCI Parkinson’s disease with mild cognitive impairment, PDNC Parkinson’s disease normal cognitive, HC healthy control.
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