. 2016 Apr 14;16:325. doi: 10.1186/s12889-016-3004-2

Table 1.

Sample characteristics of adolescent participants from 1998 to 2013

	1998		2001		2004		2007		2010		2013
	N	%	N	%	N	%	N	%	N	%	N	%
Total sample size	10340		26744		29445		23356		26648		23855
Sample size of the age group 14-17	1062	10.27	1477	5.52	1852	6.29	1066	4.56	1075	4.03	825	3.46
Male	517	48.68	718	48.61	838	45.25	503	47.19	501	46.6	404	48.97
Age
14	269	24.48	311	21.06	453	24.46	247	23.17	242	22.51	188	22.79
15	266	25.05	366	24.78	463	25.00	256	24.02	275	25.58	197	23.88
16	263	24.76	404	27.35	469	25.32	289	27.11	264	24.56	224	27.15
17	273	25.72	396	26.81	467	25.22	274	25.7	294	27.35	216	26.18
Regionality–living in major cities^a	-		-		1157	62.47	694	65.1	676	62.88	542	65.70
Socioeconomic advantage^b
Least advantaged	-		246	16.66	296	15.98	171	16.09	171	15.91	143	17.33
2nd quintile	-		345	23.36	357	19.28	193	18.16	236	21.95	158	19.15
3rd quintile	-		234	15.84	348	18.79	188	17.69	185	17.21	141	17.09
4th quintile	-		228	15.44	433	23.38	250	23.52	226	21.02	185	22.42
Most advantaged	-		424	28.71	418	22.57	261	24.55	257	23.91	198	24.00
Australian born	933	87.85	1295	87.68	1657	90.99	911	89.05	936	90.00	702	85.30
Response Rate^c		56		50		46		49		51		49

^aThe coding for area of residence in Australia was different in 1998 and 2001, and was therefore not comparable. ^bThis information was not available in the 1998 survey. ^cThis is the overall response rate of the survey