Table 1.

Descriptive statistics by education level among Vietnamese adolescents

	Total	Junior high school		Senior high school		P*
	n = 3331	n	%	n	%
Sex
Male	1557	731	46.3	655	47.2	0.615
Female	1765	849	53.7	733	52.8
Missing value	9
Food insecurity
Never/Rarely	2593	1265	80.1	1073	77.3	0.173
Sometimes	689	302	19.1	300	21.6
Most of the time/Always	34	13	0.8	15	1.1
Missing value	15
Parental understanding ‘Parents understood problems’
Yes	1038	532	33.7	390	28.1	0.001
No	2283	1048	66.3	998	71.9
Missing value	10
Parental monitoring ‘Parents were aware of free time activities’
Yes	1274	654	41.4	492	35.4	0.001
No	2035	926	58.6	896	64.6
Missing value	22
Parental control ‘Parents went through things without permission’
Yes	465	230	14.6	188	13.5	0.429
No	2814	1350	85.4	1200	86.5
Missing value	52
Supportive friends
Yes	1669	797	50.4	716	51.6	0.535
No	1644	783	49.6	48	48.4
Missing value	18
Close friendships
0	173	53	3.4	97	7.0	<  0.001
≥1	3138	1527	96.6	1291	93.0
Missing value	20
Having been physically attacked
One or more times	734	433	27.4	197	14.2	<  0.001
No	2582	1147	72.6	1191	85.8
Missing value	15
Having been in physical fight
One or more times	576	325	20.6	166	12.0	<  0.001
No	2731	1255	79.4	1222	88.0
Missing value	24
Having been bullied
One or more days	744	420	26.6	255	18.4	<  0.001
No	2456	1160	73.4	1133	81.6
Missing value	131
Mental health
Loneliness
Yes	367	137	8.7	178	12.8	<  0.001
No	2910	1443	91.3	1210	87.2
Missing value	54
Suicidal ideation
Yes	539	215	13.6	258	18.6	<  0.001
No	2750	1365	86.4	1130	81.4
Missing value	42

*Excluding all missing values n = 2968