Table 2.
Sample characteristics.
| Characteristic | 2010 (n=2000) | 2011 (n=2010) | 2012 (n=2003) | 2013 landline (n=2001) | Pa | 2013 dual-frame (n=2807) | Pa | |
| Age in years, N(%)b | ||||||||
|
|
12-15 | 669 (32) | 649 (32) | 619 (32) | 684 (31) |
|
833 (31) |
|
|
|
16-19 | 826 (31) | 833 (30) | 855 (30) | 799 (31) |
|
1046 (31) |
|
|
|
20+ | 505 (37) | 528 (38) | 529 (38) | 518 (39) | .974 | 928 (39) | .950 |
| Sex, N(%)b | ||||||||
|
|
Female | 975 (49) | 990 (49) | 992 (49) | 980 (49) |
|
1325 (49) |
|
|
|
Male | 1025 (51) | 1021 (51) | 1011 (51) | 1021 (51) | >.99 | 1482 (51) | >.99 |
| State, N(%)b | ||||||||
|
|
NSWc | 1000 (50) | 1004 (50) | 1000 (50) | 1001 (50) |
|
1407 (50) |
|
|
|
QLDh | 1000 (50) | 1000 (50) | 1000 (50) | 1000 (50) | >.99 | 1400 (50) | >.99 |
| SESd,f , N(%)b | ||||||||
|
|
Low | 557 (28) | 497 (25) | 578 (29) | 536 (26) |
|
735 (28) |
|
|
|
Moderate-high | 1443 (72) | 1514 (75) | 1425 (71) | 1465 (74) | .011 | 2056 (72) | .015 |
| Smoker, N(%)b | ||||||||
|
|
Current | 293 (16) | 243 (13) | 220 (12) | 207 (12) |
|
369 (16) |
|
|
|
Never | 1178 (56) | 1278 (61) | 1276 (61) | 1376 (64) |
|
1769 (60) |
|
|
|
Former | 53 (4) | 42 (3) | 36 (2) | 36 (3) |
|
70 (3) |
|
|
|
Experimenter | 476 (25) | 448 (24) | 471 (25) | 382 (21) | <.001 | 599 (22) | <.001 |
| Internet-based tobacco promotion exposure, N(%)b | ||||||||
|
|
Never/rarely | 1330 (70) | 1273 (66) | 1200 (62) | 1158 (61) |
|
1651 (59) |
|
|
|
Adsg and brandinge | 218 (11) | 266 (13) | 313 (15) | 335 (16) |
|
442 (16) |
|
|
|
Ads onlye | 208 (10) | 240 (12) | 245 (12) | 272 (13) |
|
395 (15) |
|
|
|
Branding onlye | 200 (10) | 205 (10) | 223 (11) | 215 (10) | <.001 | 293 (11) | <.001 |
| Friends who smoke, mean (SD) | 1.27 (1.60) | 1.10 (1.51) | 1.05 (1.47) | 0.93 (1.41) | <.001 | 1.11 (1.52) | <.001 | |
| Household members who smoke, mean (SD) | 0.52 (0.86) | 0.47 (0.86) | 0.49 (1.01) | 0.42 (0.82) | .048 | 0.51 (0.99) | <.001 | |
| Internet use in hours, mean (SD) | 2.43 (2.36) | 2.63 (2.49) | 2.90 (2.59) | 3.28 (2.96) | <.001 | 3.33 (3.00) | <.001 | |
aP values from chi-square tests for differences between proportions or analysis of variance tests for differences between means.
bNumbers are unweighted, percentages are weighted.
cNSW: New South Wales;.
dBased on postal code.
eSometimes/rarely exposed.
fSES: socioeconomic status
gads: advertisements.
hQLD: Queensland.