Table 1.

Characteristics of respondents.

Characteristics	Overall		Self-medication		No self-medication		P-value
	(n = 4,608)		(n = 1,116)		(n = 3,492)
	n	%	n	%	n	%
Parent's age							0.292
LT30	921	19.99	211	18.91	710	20.33
30–39	2,982	64.71	744	66.67	2,238	64.09
GT40	705	15.30	161	14.43	544	15.58
Relationship							0.005
Father	1,045	22.68	219	19.62	826	23.65
Mother	3,563	77.32	897	80.38	2,666	76.35
Parent's education							<0.0001
Middle school	847	18.38	233	20.88	614	17.58
High school	990	21.48	270	24.19	720	20.62
College	2,437	52.89	575	51.52	1,862	53.32
Graduate	334	7.25	38	3.41	296	8.48
Regions							<0.0001
Northeast China	33	0.72	6	0.54	27	0.77
Northern China	1,794	38.93	603	54.03	1,191	34.11
Eastern China	1,472	31.94	243	21.77	1,229	35.19
Southern China	87	1.89	11	0.99	76	2.18
Central China	302	6.55	66	5.91	236	6.76
Northwest China	477	10.35	118	10.57	359	10.28
Southwest China	443	9.61	69	6.18	374	10.71
Children's age							<0.0001
LT1	150	3.26	21	1.88	129	3.69
1–3	309	6.71	50	4.48	259	7.42
3–5	1,350	29.30	309	27.69	1,041	29.81
6–11	2,799	60.74	736	65.95	2,063	59.08