Table 5. Regression analysis for depression by interpersonal relationship quality among NLBC, LBC and MC.

	Model 1-NLBC a			Model 2-LBCO b			Model 3-LBCB c			Model 4-MC d
	OR	95% CI	P-value	OR	95% CI	P-value	OR	95% CI	P-value	OR	95%CI	P-value
Quality of relationships PPCR&PTCR = ref.
NPCR&PTCR	4.58	2.66–7.88	<0.001	2.84	1.33–6.07	0.007	4.67	1.93–11.31	0.001	1.98	0.85–4.66	0.116
PPCR&NTCR	2.59	1.55–4.33	<0.001	2.42	1.23–4.77	0.011	2.59	0.84–4.31	0.122	3.01	1.29–6.99	0.010
NPCR&NTCR	7.59	4.77–12.08	<0.001	6.73	3.68–12.32	<0.001	6.33	3.04–13.18	<0.001	5.70	2.74–11.85	<0.001
Gender male = ref.
female	0.92	0.68–1.25	0.603	1.17	0.76–1.80	0.480	0.68	0.38–1.21	0.189	1.42	0.91–2.22	0.127
Age group above 14 = ref.
under 11	1.21	0.78–1.88	0.388	1.11	0.55–2.25	0.771	1.35	0.54–3.37	0.524	1.73	0.70–4.25	0.236
11–14	0.88	0.62–1.25	0.469	1.00	0.61–1.64	0.988	1.68	0.86–3.29	0.129	1.25	0.52–3.04	0.622
Mother’s education level Senior high school/above = ref.
Primary/below	1.46	0.93–2.28	0.100	1.29	0.68–2.46	0.434	1.59	0.69–3.65	0.277	0.61	0.34–1.07	0.084
Junior high school	0.98	0.63–1.52	0.923	0.72	0.36–1.43	0.345	0.96	0.43–2.12	0.912	0.64	0.36–1.11	0.113
Family financial situation Rich = ref.
Common	1.18	0.59–2.38	0.646	0.57	0.21–1.51	0.256	0.69	0.23–2.11	0.514	1.10	0.62–1.96	0.753
Poor	2.34	1.13–4.81	0.021	1.39	0.53–3.70	0.505	1.56	0.51–4.79	0.440	2.41	1.15–5.07	0.020

Note, NLBC = Non-left-behind rural children, LBC = Children who were left behind, LBCO = Children who were left behind by one parent, LBCB = Children who were left behind by both parents, MC = Migrant children. PPCR = Positive parent-child relationship, NPCR = Negative parent-child relationship, PTCR = Positive teacher-child relationship, NTCR = Negative teacher-child relationship

a, b, c, d have missing data.

^a. N = 1912;

^b. N = 817;

^c. N = 413,

^d. N = 554.