Table 3. Mixed effect analysis of the association between loneliness, peer support, close friends and suicidal ideation among the in-school adolescents.

Variables	Model O	Model I	Model II
		aOR [95% CI]	aOR [95% CI]
Fixed effect results
Felt lonely
No		1.00	1.00
Yes		2.49*** [2.25, 2.75]	1.88*** [1.69, 2.09]
Peer support
No		1.00	1.00
Yes		0.84*** [0.78, 0.92]	0.89* [0.82, 0.97]
Close friends
No		1.00	1.00
Yes		0.76*** [0.68, 0.85]	0.77*** [0.68, 0.86]
Age group (years)
11–14			1.00
15–19			1.08 [0.99, 1.18]
Sex
Female			1.00
Male			0.77*** [0.71, 0.83]
Felt hungry
No			1.00
Yes			1.33*** [1.18, 1.49]
Anxiety
No			1.00
Yes			1.95*** [1.76, 2.17]
Current cigarette smoking
No			1.00
Yes			1.62*** [1.39, 1.89]
Current tobacco use
No			1.00
Yes			1.33** [1.12, 1.58]
Current alcohol use
No			1.00
Yes			1.30*** [1.18, 1.42]
Current marijuana use
No			1.00
Yes			1.24* [1.01, 1.52]
Parent or guardian supervision
No			1.00
Yes			1.04 [0.96, 1.14]
Parent or guardian connectedness
No			1.00
Yes			0.82*** [0.75, 0.90]
Parent or guardian bonding
No			1.00
Yes			0.92 [0.84, 1.01]
Parent or guardian respect for privacy
No			1.00
Yes			0.79*** [0.73, 0.86]
Random effect results
Primary sampling unit variance (95% CI)	0.020 [0.008, 0.046]	0.017 [0.007, 0.044]	0.014 [0.005, 0.040]
Intra-Class Correlation	0.006	0.005	0.004
Likelihood ratio test	13.51 (<0.001)	10.75 (<0.001)	7.77 (0.003)
Wald chi-square	Reference	374.60 (<0.001)	877.56 (<0.001)
Model fitness
Log-likelihood	-8614.7636	-8441.1852	-8177.9355
Akaike Information Criterion	17233.53	16892.37	16389.87
Total sample	19,119	19,119	19,119
Number of clusters	122	122	122

* p < 0.05,

** p < 0.01,

*** p < 0.001

*Model I consisted of only the key explanatory variables

*Model II was adjusted for the covariates