Interoception mediates the association between social support and sociability in patients with major depressive disorder

Table 1 Demographic data for participants

Variable	MD (n = 292)	HC (n = 257)	Test statistic
Age (years), M (p25, p75)	25.0 (20.0-34.8)	24.0 (22.0-28.5)	z = -0.7826, P = 0.434
Gender (female), n (%)	183 (62.7)	160 (54.8)	χ2 = 0.0100, P = 0.920
Height (cm), M (p25, p75)	167.0 (162.0-172.0)	165.0 (160.0-173.0)	z = -0.0508, P = 0.960
Weight (kg), M (p25, p75)	58.0 (50.0-69.8)	60.0 (53.0-70.0)	z = -1.2459, P = 0.213
Education (year), M (p25, p75)	14.0 (12.0-16.0)	16.0 (15.0-18.0)	z = -10.2783, P < 0.001
Physical activity, M (p25, p75)	4.0 (1.0-12.0)	8.0 (3.0-18.0)	z = -4.7502, P < 0.001
Depression state (mean ± SD)	19.0 (14.0-23.0)	1.0 (0-2.0)	z = -20.3641, P < 0.001
Anxiety state (mean ± SD)	12.0 (9.0-16.0)	1.0 (0-2.0)	z = -19.6389, P < 0.001
Disease course (month) (mean ± SD)	40.7 (56.8)
BMI, n (%)
< 18.5	74 (25.3)	29 (11.3)	χ2 = 33.5618, P < 0.001
18.5-23.9	190 (65.1)	164 (63.8)
> 23.9	28 (9.6)	64 (24.9)
Annual household income (CNY), n (%)
< 100000	65 (22.3)	114 (44.4)	χ2 = 33.4600, P < 0.001
100000-300000	186 (63.7)	126 (49.01)
300000-500000	32 (11.0)	15 (5.8)
> 500000	9 (3.1)	2 (0.8)
Social media usage (hours), n (%)
< 3 hours	48 (16.4)	42 (16.3)	χ2 = 13.6544, P = 0.003
3-5 hours	93 (31.9)	99 (39.0)
5-8 hours	67 (23.0)	75 (29.2)
> 8 hours	84 (28.8)	41 (16.0)
SSRS scores	31.38 (8.06)	41.11 (9.09)	t = 13.2741, P < 0.001
TSBI scores	80.3 (17.2)	98.6 (14.8)	t = 13.2293, P < 0.001

MD: Major depression; HC: Health control; SSRS: Social support rating scale; TSBI: Texas social behavior inventory; M: Median and interquartile range; p25: 25^th percentile; p75: 75^th percentile; BMI: Body mass index; CNY: Chinese yuan.