Table 3.
Results of ANCOVA.
HCs ( n = 400) | MDD ( n = 37) | Age-by-group interaction | Effect of group | ||||||
---|---|---|---|---|---|---|---|---|---|
Median | SD | Median | SD | df | F-value | p-value | F-value | p-value | |
Free-viewing test | |||||||||
Number of fixations | 23.00 | 3.32 | 21.50 | 4.93 | 1,433 | 5.07 | 2.5 × 10−2* | N/A | N/A |
Duration of fixation | 254.50 | 46.30 | 267.00 | 86.41 | 1,433 | 5.51 | 1.9 × 10−2* | N/A | N/A |
Number of saccades | 21.00 | 3.80 | 20.00 | 5.33 | 1,433 | 7.19 | 7.6 × 10−3* | N/A | N/A |
Duration of saccades | 42.38 | 5.59 | 42.50 | 6.65 | 1,433 | 0.10 | 0.75 | 0.91 | 0.34 |
Saccade amplitude | 4.00 | 1.17 | 3.60 | 0.99 | 1,433 | 0.00 | 0.99 | 0.66 | 0.42 |
Average saccade velocity | 93.94 | 19.25 | 81.99 | 17.50 | 1,433 | 0.12 | 0.73 | 2.51 | 0.11 |
Peak saccade velocity | 185.10 | 44.55 | 181.81 | 43.85 | 1,433 | 0.73 | 0.39 | 0.01 | 0.91 |
Scanpath length | 110.70 | 28.81 | 92.56 | 34.98 | 1,433 | 2.19 | 0.14 | 8.30 | 4.2 × 10−3** |
Fixation density | 0.88 | 0.39 | 0.92 | 0.51 | 1,433 | 9.58 | 2.1 × 10−3* | N/A | N/A |
Main sequence vmax | 436.81 | 119.83 | 419.68 | 107.90 | 1,433 | 0.39 | 0.53 | 0.41 | 0.52 |
Main sequence s | 9.29 | 4.40 | 7.63 | 3.95 | 1,433 | 0.00 | 0.95 | 0.13 | 0.72 |
Main sequence v0 | 33.93 | 9.88 | 32.60 | 10.27 | 1,433 | 0.57 | 0.45 | 0.01 | 0.94 |
Number of blinks | 1.00 | 1.49 | 1.00 | 1.31 | 1,433 | 3.64 | 0.06 | 0.45 | 0.50 |
Smooth pursuit test | |||||||||
Horizontal SNR | 2.03 | 0.16 | 2.02 | 0.18 | 1,433 | 2.74 | 0.10 | 0.00 | 0.95 |
Horizontal position gain | 1.01 | 0.03 | 1.00 | 0.03 | 1,433 | 0.93 | 0.33 | 0.34 | 0.56 |
Horizontal RMSE | 8.35 | 4.18 | 8.78 | 4.11 | 1,433 | 2.30 | 0.13 | 0.39 | 0.53 |
Vertical SNR | 1.84 | 0.20 | 1.80 | 0.20 | 1,433 | 1.22 | 0.27 | 0.27 | 0.60 |
Vertical position gain | 0.96 | 0.07 | 0.95 | 0.09 | 1,433 | 0.67 | 0.41 | 1.18 | 0.28 |
Vertical RMSE | 14.03 | 7.94 | 13.83 | 9.69 | 1,433 | 1.56 | 0.21 | 0.15 | 0.70 |
Number of fixations | 58.25 | 13.77 | 60.00 | 13.99 | 1,433 | 0.17 | 0.68 | 1.00 | 0.32 |
Duration of fixations | 259.88 | 69.00 | 250.75 | 79.92 | 1,433 | 1.29 | 0.26 | 4.27 | 0.04 |
Number of saccades | 56.00 | 15.71 | 59.50 | 13.85 | 1,433 | 0.16 | 0.69 | 0.73 | 0.39 |
Duration of saccades | 30.13 | 5.63 | 34.50 | 9.41 | 1,433 | 3.62 | 0.06 | 8.54 | 3.7 × 10−3** |
Saccade amplitude | 1.94 | 0.62 | 2.38 | 0.71 | 1,433 | 3.22 | 0.07 | 5.40 | 0.02 |
Average saccade velocity | 65.13 | 11.71 | 70.80 | 9.85 | 1,433 | 0.00 | 0.96 | 1.42 | 0.23 |
Peak saccade velocity | 98.05 | 38.71 | 136.46 | 46.52 | 1,433 | 2.32 | 0.13 | 8.41 | 3.9 × 10−3** |
Horizontal velocity gain | 0.85 | 0.11 | 0.77 | 0.14 | 1,433 | 0.85 | 0.36 | 4.60 | 0.03 |
Vertical velocity gain | 0.76 | 0.13 | 0.70 | 0.16 | 1,433 | 0.59 | 0.44 | 1.43 | 0.23 |
Number of blinks | 1.00 | 4.00 | 1.00 | 2.57 | 1,433 | 0.10 | 0.76 | 0.24 | 0.62 |
Fixation stability test | |||||||||
Number of fixations | 3.00 | 2.46 | 3.25 | 2.71 | 1,433 | 0.25 | 0.62 | 0.10 | 0.75 |
Duration of fixation | 2057.19 | 1492.87 | 1422.50 | 1558.35 | 1,433 | 0.21 | 0.64 | 0.50 | 0.48 |
Number of saccades | 1.50 | 2.30 | 2.00 | 2.53 | 1,433 | 0.91 | 0.34 | 0.04 | 0.85 |
Scanpath length | 1.13 | 2.21 | 1.36 | 2.43 | 1,433 | 0.23 | 0.63 | 0.02 | 0.89 |
Number of microsaccades | 6.25 | 3.51 | 6.50 | 4.17 | 1,433 | 0.46 | 0.50 | 0.13 | 0.72 |
Number of blinks | 0.00 | 0.97 | 0.00 | 0.70 | 1,433 | 2.68 | 0.10 | 0.04 | 0.84 |
RMSE, Root mean square error; SNR, signal-to-noise ratio; N/A, not applicable.
p < 0.05.
Represents significant after false discovery rate correction.