Table 1 Characteristics of students by tobacco-related use profiles (PST study, n = 17,435, 2013–2017)
From: What differentiates youths who use e-cigarettes from those who smoke traditional tobacco products?
| Â | Non users | Exclusive e-cigarette users | Exclusive tobacco users | Dual users | P valuea |
|---|---|---|---|---|---|
(n = 15,118) | (n = 392) | (n = 1370) | (n = 555) | ||
n (%) | n (%) | n (%) | n (%) | ||
First initiated tobacco-related product | |||||
 Tobacco (except hookah) | NA | 151 (38.5) | 1189 (86.8) | 455 (82.0) |  < 0.0001 |
 E-cigarette | NA | 128 (32.7) | 27 (2.0) | 19 (3.4) | |
 Hookah | 1137 (7.5) | 53 (13.5) | 108 (7.9) | 57 (10.3) | |
Age | |||||
  ≤ 13 years | 6157 (40.7) | 146 (37.2) | 63 (4.6) | 34 (6.1) |  < 0.0001 |
 14–17 years | 5554 (36.7) | 187 (47.7) | 587 (42.9) | 295 (53.2) | |
  > 17 years | 3344 (22.1) | 56 (14.8) | 715 (52.2) | 226 (40.7) | |
Sex | |||||
 Female | 7621 (51.5) | 173 (45.5) | 767 (57.0) | 277 (50.6) |  < 0.0001 |
 Male | 7174 (48.5) | 207 (54.5) | 578 (43.0) | 270 (49.4) | |
Grade | |||||
 Middle school |  < 0.0001 | ||||
  1st level | 2183 (14.4) | 20 (5.1) | 9 (0.7) | 6 (1.1) | |
  2nd level | 2085 (13.8) | 40 (10.2) | 15 (1.1) | 8 (1.4) | |
  3rd level | 2243 (14.8) | 98 (25.0) | 51 (3.7) | 27 (4.9) | |
  4th level | 1998 (13.2) | 77 (19.6) | 100 (7.3) | 57 (10.3) | |
 High school | |||||
  1st level | 2164 (14.3) | 67 (17.1) | 325 (23.7) | 149 (26.8) | |
  2nd level | 2196 (14.6) | 48 (12.2) | 427 (31.2) | 159 (28.6) | |
  3rd level | 1517 (10.0) | 38 (9.7) | 335 (24.4) | 122 (22.0) | |
 Preparation for engineering competitions | 391 (2.6) | 1 (0.3) | 71 (5.2) | 17 (3.1) | |
 Others | 341 (2.3) | 3 (0.8) | 37 (2.7) | 10 (1.8) | |
Cannabis use | |||||
 Never experienced | 10,489 (69.4) | 271 (69.1) | 278 (20.3) | 77 (13.9) |  < 0.0001 |
 Already experienced | 1305 (8.6) | 63 (16.1) | 490 (35.8) | 186 (33.5) | |
 At least one time per month | 685 (4.5) | 32 (8.2) | 560 (40.9) | 274 (49.4) | |
Alcohol consumption | |||||
 Never drink | 8907 (58.9) | 159 (40.6) | 167 (12.2) | 47 (8.5) |  < 0.0001 |
 Drink sometimes but less than once a month | 2625 (17.4) | 96 (24.5) | 261 (19.1) | 99 (17.8) | |
 Drink more than once a month | 2957 (19.6) | 110 (28.1) | 860 (62.8) | 380 (68.5) | |
Hookah ever experienced | |||||
 No | 10,455 (69.2) | 159 (40.6) | 157 (11.5) | 51 (9.2) |  < 0.0001 |
 Yes | 4101 (27.1) | 207 (52.8) | 1185 (86.5) | 500 (90.1) | |
Smoking status of the best friend | |||||
 Non-smoking | 10,266 (67.9) | 225 (57.4) | 250 (18.3) | 83 (15.0) |  < 0.0001 |
 Smoker/Former smoker | 2792 (18.5) | 111 (28.3) | 957 (69.9) | 416 (75.0) | |
Smoking status of brothers/sisters | |||||
 Non-smoking | 11,770 (80.6) | 272 (72.2) | 734 (54.7) | 306 (56.2) |  < 0.0001 |
 Smoker/Former smoker | 2829 (19.4) | 105 (27.8) | 608 (45.3) | 239 (43.8) | |
Perception of peer smoking rateb | |||||
 None | 4516 (29.9) | 60 (15.3) | 24 (1.8) | 10 (1.8) |  < 0.0001 |
 Between 1 and 5 | 7334 (48.5) | 244 (62.2) | 734 (53.6) | 261 (47.0) | |
 Between 6 and 10 | 2491 (16.5) | 70 (17.9) | 572 (41.8) | 274 (49.4) | |
Parental ban on smoking | |||||
 No | 6308 (41.7) | 142 (36.2) | 734 (53.6) | 286 (51.5) |  < 0.0001 |
 Yes | 8216 (54.5) | 240 (61.2) | 594 (43.4) | 258 (46.5) | |
Survey year | |||||
 2013 | 2790 (18.5) | 43 (11.0) | 347 (25.3) | 99 (17.8) |  < 0.0001 |
 2014 | 2888 (19.1) | 109 (77.8) | 224 (16.4) | 142 (25.6) | |
 2015 | 3028 (20.0) | 96 (24.5) | 273 (19.9) | 120 (21.6) | |
 2016 | 3081 (20.4) | 79 (20.2) | 284 (20.7) | 103 (18.6) | |
 2017 | 3331 (22.0) | 65 (16.6) | 242 (17.7) | 91 (16.4) | |