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.