Table 2.

Five health dimension scores and single-factor analysis results of each factor of the PROMIS

Item	Category	N	Percent %	p-value
				Depression	Anger	Anxiety	Fatigue	Peer relationships
1. Demographic information and physical exam
2003Grade	Grade 3	60	31.6	0.032	0.001	0.216	0.000	< 0.0001
	Grade 4	31	16.3
	Grade 5	46	24.2
	Grade 6	53	27.9
Gender	Female	99	52.1	0.842	0.550	0.205	0.288	0.049
	Male	90	47.4
Age	10	9	4.7	0.071	0.215	0.234	0.006	0.020
	11	26	13.7
	12	59	31.1
	13	37	19.5
	14	28	14.7
	15	21	11.1
	> 15	10	5.3
2. Family conditions
Location	Urban	9	4.7	0.263	0.053	0.101	0.001	0.048
	Rural	115	60.5
	Pastoral	60	31.6
	Other	6	3.2
Living with parents	Yes	178	93.7	0.896	0.903	0.469	0.997	0.148
	No	12	6.3
The only child of the family	Yes	2	1.1	0.218	0.353	0.060	0.398	0.574
	No	188	98.9
Father’s education level	Elementary school and below	73	38.4	0.271	0.295	0.053	0.011	0.039
	Middle school	10	5.3
	High school and above	7	3.7
	Don’t know	100	52.6
Mother’s education level	Elementary and below	74	38.9	0.085	0.027	0.076	0.003	0.766
	Middle school	6	3.2
	High school and above	7	3.7
	Don’t know	103	54.2
Family financial situation	Rich	19	10	0.023	0.105	0.004	0.031	0.276
	Middle level	151	79.5
	poor	20	10.5
3. School life
No. of students in a single dormitory	Below 5	18	9.5	0.754	0.425	0.522	0.610	0.021
	5-10	39	20.5
	11-15	111	58.4
	above 15	22	11.6
Visits home per month	4	119	62.6	0.978	0.682	0.299	0.275	0.387
	2-3	36	18.9
	1	27	14.2
	Sometimes not going home for one month	8	4.2
Distance to home	Within 1 h	80	42.1	0.504	0.317	0.085	0.011	0.265
	2-4 h	81	42.6
	4-6 h	22	11.6
	6 h	7	3.7
Relationship with schoolmates	Good	141	74.2	0.070	0.063	0.580	0.245	0.063
	General	46	24.2
	bad	3	1.6
Study pressure	Great	34	17.9	0.143	0.025	0.153	0.026	0.379
	General	133	70
	Small or no pressure	23	12.1
Hours of homework	Half an hour	72	37.9	0.731	0.203	0.033	0.001	0.692
	0.5-1 h	70	36.8
	1-2 h	30	15.8
	Above 2 h	18	9.5
Hours of sleep each night	Above 10 h	24	12.6	0.574	0.673	0.487	0.042	0.049
	9-10 h	34	17.9
	8-9 h	80	42.1
	Below 8 h	52	27.4
Total		190	100