Table 1.

Demographic characteristics of participants (N = 271).

	Experimental groupa		Control groupb
Characteristic	n	%	n	%
Gender
Male	71	54	73	52
Female	61	46	66	48
Age at time of survey (years)
11	4	3	4	3
12	56	43	28	20
13	54	41	66	48
14	16	12	31	22
15	2	1	10	7
Number of brothers
One	32	24	30	22
Two	77	59	77	55
Three	19	14	20	14
Four	4	3	7	5
Five or more	–	–	5	4
Family unit
Father and mother	105	79	125	90
Mother	23	17	10	7
Others	2	2	3	2
Don’t know/don’t answer	2	2	1	1
Father’s highest education level completed
Elementary school	36	27	32	23
Junior high school	35	27	52	37
High school	27	20	33	24
Bachelor’s degree or above	33	25	22	16
Don’t know	1	1	–	–
Mother’s highest education level completed
Elementary school	42	32	17	12
Junior high school	39	29	51	37
High school	17	13	31	22
Bachelor’s degree or above	34	26	40	29

^an = 132; ^bn = 139.