Autonomic function characteristics and stratification analysis of adolescent patients with depressive disorders based on the low-frequency:high-frequency ratio

Table 1 General characteristics of adolescents with depressive disorders (n = 269), n (%)/mean ± SD/median (interquartile range)

Item	Classification	Statistic
Gender	Male	95 (35.32)
	Female	174 (64.68)
Diagnose	Depressive episode	156 (57.99)
	Recurrent depressive disorder	113 (42.01)
Medical-seeking status	Initial onset	170 (63.20)
	Recurrent episodes	99 (36.80)
Place of residence	City proper	101 (37.55)
	Town	71 (26.39)
	Rural area	97 (36.06)
Payment method	At one’s own expense	126 (46.84)
	Medical insurance	143 (53.16)
Per capita monthly household income	< 3000	89 (33.09)
	3000-8000	109 (40.52)
	> 8000	71 (26.39)
Caregiver status	Parents	103 (38.29)
	Single parent (mother)	102 (37.92)
	Single parent (father)	64 (23.79)
Family relationships	Intimate	88 (32.71)
	Same as	91 (33.83)
	Drift apart	90 (33.46)
Adverse experiences	No	163 (60.59)
	Yes	106 (39.41)
Body mass index	Normal	121 (44.98)
	Too light	74 (27.51)
	Excess weight	38 (14.13)
	Fat	36 (13.38)
SAS scores	Normal	86 (31.97)
	Mild	94 (34.94)
	Moderate	55 (20.45)
	Severe	34 (12.64)
SDS scores	Normal	59 (21.93)
	Mild	87 (32.34)
	Moderate	78 (29.00)
	Severe	45 (16.73)
LF:HF ratio	Normal	117 (43.49)
	Markedly sympathetic bias	82 (30.49)
	Markedly biased toward the parasympathetic system	70 (26.02)
Age		15.18 ± 1.35
Disease duration factors (year)		0 (0-0.50)

SDS: Self-rating Depression Scale; SAS: Self-rating Anxiety Scale; LF:HF: Low-frequency:high-frequency.