Predicting South Korea adolescents vulnerable to depressive disorder using Bayesian nomogram: A community-based cross-sectional study

Table 1 Measurements of explanatory variables

Classification	Variable	Characteristics
Sociodemographic factors	Gender	Male or female
	Number of siblings (including the subject)	1 person, 2 people, 3 people, or 4 people or more
Environmental factors	Mean conversation time with parents per day	< 30 min, ≥ 30 min and < 1 h, ≥ 1 h and < 2 h, ≥ 2 h and < 3 h, or ≥ 3 h
Personal factors	Satisfaction with academic achievement	Dissatisfied, not dissatisfied or satisfied, or satisfied
	Satisfaction with school life	Dissatisfied, not dissatisfied or satisfied, or satisfied
	Mean sleeping hours per day	< 5 h, 6 h, 7 h, 8 h, 9 h, or ≥ 10 h
	Social withdrawal	Continuous variable
	Aggression	Continuous variable
	Attention	Continuous variable
	Physical symptoms	Continuous variable

Table 2 General characteristics of subjects (mean ± SD)

Characteristic	n	%
Depressive disorder
No	1999	82.0
Yes	439	18.0
Gender
Male	1318	54.1
Female	1120	45.9
Number of siblings (including the subject)
1 person	358	14.7
2 people	1487	61.0
3 people	515	21.1
4 people	78	3.2
Mean sleeping hours per day
< 5 h	63	2.6
6 h	236	9.7
7 h	600	24.6
8 h	986	40.4
9 h	454	18.6
≥ 10 h	99	4.1
Mean conversation time with parents per day
< 30 min	456	18.7
≥ 30 min and < 1 h	781	32.0
≥ 1 h and < 2 h	644	26.4
≥ 2 h and < 3 h	351	14.4
≥ 3 h	206	8.4
Satisfaction with academic achievement
Dissatisfied	577	23.9
Not dissatisfied or satisfied	906	37.6
Satisfied	928	38.5
Satisfaction with school life
Dissatisfied	144	5.9
Not dissatisfied or satisfied	616	25.4
Satisfied	1666	68.7
Attention	15.2 ± 3.9
Aggression	11.4 ± 3.5
Social withdrawal	10.6 ± 3.5
Physical symptoms	14.9 ± 4.8

Table 3 Characteristics by prevalence of depressive disorder, n (%) (mean ± SD)

Characteristic	Depressive disorder		P value
	No (n = 1999)	Yes (n = 439)
Gender			< 0.001
Male	1119 (84.9)	199 (15.1)
Female	880 (78.6)	240 (21.4)
Number of siblings (including the subject)			0.671
1 person	301 (84.1)	57 (15.9)
2 people	1217 (81.8)	270 (18.2)
3 people	419 (81.4)	96 (18.6)
4 people	62 (79.5)	16 (20.5)
Mean sleeping hours per day			<0.001
< 5 h	44 (69.8)	19 (30.2)
6 h	191 (80.9)	45 (19.1)
7 h	512 (85.3)	88(14.7)
8 h	841 (85.3)	145 (14.7)
9 h	350 (77.1)	104 (22.9)
≥ 10 h	61 (61.6)	38 (38.4)
Mean conversation time with parents per day			< 0.001
< 30 min	240 (74.6)	116 (25.4)
≥ 30 min and < 1 h	645 (82.6)	136 (17.4)
≥ 1 h and < 2 h	539 (83.7)	105 (16.3)
≥ 2 h and < 3 h	293 (83.5)	58 (16.5)
≥ 3 h	182 (88.3)	24 (11.7)
Satisfaction with academic achievement			< 0.001
Dissatisfied	434 (75.2)	143 (24.8)
Not dissatisfied or satisfied	735 (81.1)	171 (18.9)
Satisfied	812 (87.5)	116 (12.5)
Satisfaction with school life			< 0.001
Dissatisfied	63 (43.8)	81 (56.3)
Not dissatisfied or satisfied	470 (76.3)	146 (23.7)
Satisfied	1457 (87.5)	209 (12.5)
Attention	14.6 ± 3.8	17.7 ± 3.1	< 0.001
Aggression	10.6 ± 3.1	15.1 ± 3.1	< 0.001
Social withdrawal	10.0 ± 3.3	13.6 ± 2.9	< 0.001
Physical symptoms	13.7 ± 4.2	20.2 ± 3.7	< 0.001