Table 5.

Relationships of AST and control variables with no depressive symptoms by age group.

Variables		No Depressive Symptoms
		7th			8th			9th
		Adjusted OR	95%CI		Adjusted OR	95%CI		Adjusted OR	95%CI
Sex
	Boy	ref			ref			ref
	Girl	1.03	0.84	1.25	0.79	0.63	1.00	0.97	0.74	1.26
Weight Status
	Non-obesity	ref			ref			ref
	Obesity	0.71	0.52	0.99	1.17	0.79	1.72	1.31	0.84	2.05
ST
	Excessive	ref			ref			ref
	Limited	1.20	0.95	1.53	1.25	0.97	1.61	0.96	0.71	1.30
Smoking status
	never	ref			ref			ref
	rarely	1.07	0.54	2.12	0.82	0.48	1.42	0.47	0.26	0.85
	sometimes	0.38	0.16	0.91	0.80	0.28	2.26	0.55	0.26	1.15
	most	0.21	0.03	1.35	1.03	0.11	9.69	0.67	0.19	2.33
	always	0.36	0.07	1.97	0.15	0.05	0.50	0.81	0.33	1.99
Drinking
	never	ref			ref			ref
	rarely	0.65	0.47	0.91	0.68	0.50	0.93	0.78	0.54	1.13
	sometimes	0.41	0.20	0.84	0.52	0.27	1.04	0.34	0.16	0.72
	most	0.53	0.06	4.62	0.35	0.10	1.26	0.75	0.15	3.86
	always	1.01	0.19	5.28	0.54	0.14	2.07	0.28	0.06	1.22
Friends
	0	ref			ref			ref
	1	1.56	1.01	2.39	1.47	0.90	2.40	1.58	0.93	2.68
	2	1.69	1.13	2.52	1.50	0.95	2.35	1.71	1.04	2.80
	3 or more	1.79	1.27	2.51	1.77	1.18	2.65	2.28	1.47	3.54
AST
	Passive	ref			ref			ref
	Active	1.13	0.93	1.37	1.25	1.01	1.55	1.30	1.01	1.68

ST: sedentary time; excessive: more than 2 h of ST per day; limited: no more than 2 hours of ST per day; ref: reference group; OR: odds ratio; CI: confidence interval; bold fonts denote statistical significance.