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. 2022 Jan 10;13:809853. doi: 10.3389/fnagi.2021.809853

TABLE 2.

Comparisons on demographic/characteristics between the MDD and HC groups.

	MDD (n = 971), mean ± SD	HCs (n = 902), mean ± SD	Group comparisons
Age (years)	37.43 ± 14.80	36.88 ± 16.15	t = 0.759, p = 0.448
Sex (male/female)	344/627	368/534	χ² = 5.724, p = 0.017
Education (years)	11.43 ± 4.09	12.47 ± 4.90	t = −4.996, p < 0.001
Mean FD (mm)	0.07 ± 0.03	0.07 ± 0.04	t = −1.075, p = 0.282
Illness duration (months)^a	38.54 ± 60.64	/	/
HAMD score^a	20.63 ± 7.83	/	/
HAMA score^a	19.43 ± 8.90	/	/

^aData on duration of illness, HAMD score and HAMA score was available for 747, 813, and 561 patients, respectively.