Table 1 General characteristics of the study population by smoking trajectory group
Total | Never smokers | Persistent light smokers | Late escalators | Early established smokers | |
|---|---|---|---|---|---|
N (%) | N (%) | N (%) | N (%) | ||
Total | 1723 (100.0) | 1290 (74.9) | 79 (4.6) | 151 (8.8) | 203 (11.8) |
Age, y (w2) (mean ± SD) | 13.9 ± 0.43 | 13.9 ± 0.35 | 13.9 ± 0.43 | 13.9 ± 0.32 | 13.9 ± 0.29 |
Gender (w2) | |||||
Girls | 870 (50.5) | 778 (60.3) | 25 (31.7) | 46 (30.5) | 21 (10.3) |
Boys | 853 (49.5) | 512 (39.7) | 54 (68.4) | 105 (69.5) | 182 (89.7) |
Family income (w2) a | |||||
T1 | 569 (33.6) | 414 (32.1) | 23 (28.9) | 52 (34.3) | 80 (39.2) |
T2 | 507 (29.4) | 380 (29.4) | 25 (31.9) | 41 (27.4) | 61 (29.9) |
T3 | 647 (37.6) | 496 (38.4) | 31 (39.2) | 58 (38.3) | 63 (30.9) |
Type of high school (w4) a | |||||
General | 1374 (79.7) | 1056 (81.9) | 60 (76.0) | 127 (84.4) | 131 (64.3) |
Vocational | 349 (20.3) | 234 (18.1) | 19 (24.1) | 24 (15.6) | 72 (35.7) |
College status (w7) | |||||
College students | 1255 (72.8) | 968 (75.0) | 59 (74.7) | 109 (72.2) | 119 (58.6) |
Non-college students | 468 (27.2) | 322 (25.0) | 20 (25.3) | 42 (27.8) | 84 (41.4) |
Number of days not supervised by a guardian after school (w2) a | |||||
Almost none | 923 (53.6) | 708 (54.9) | 41 (52.2) | 83 (55.0) | 90 (44.2) |
1–2 days | 193 (11.2) | 145 (11.2) | 6 (7.6) | 17 (11.3) | 25 (12.4) |
≥ 3 days | 607 (35.2) | 436 (33.8) | 32 (40.3) | 51 (33.8) | 88 (43.3) |
Smoking friends (w2) | |||||
0 | 1333 (77.4) | 1061 (82.3) | 50 (63.3) | 108 (71.5) | 114 (56.2) |
1 ≤ | 390 (22.6) | 229 (17.8) | 29 (36.7) | 43 (28.5) | 89 (43.8) |
Drinking experience (w2) | |||||
No | 1648 (95.7) | 1257 (97.4) | 70 (88.6) | 149 (98.7) | 172 (84.7) |
Yes | 75 (4.4) | 33 (2.6) | 9 (11.4) | 2 (1.3) | 31 (15.3) |
School adjustment (w2) | |||||
T1 | 367 (21.3) | 238 (18.5) | 20 (25.3) | 33 (21.9) | 76 (37.4) |
T2 | 682 (39.6) | 528 (40.9) | 26 (32.9) | 56 (37.1) | 72 (35.5) |
T3 | 674 (39.1) | 524 (40.6) | 33 (41.8) | 62 (41.1) | 55 (27.1) |
Experience of health-related education (w2) a | |||||
No | 1427 (82.8) | 1069 (82.9) | 66 (83.5) | 125 (82.6) | 167 (82.3) |
Yes | 296 (17.2) | 221 (17.1) | 13 (16.5) | 26 (17.4) | 36 (17.7) |
Mobile phone dependency (w2) a | |||||
T1 | 525 (30.5) | 394 (30.6) | 21 (26.3) | 55 (36.4) | 55 (26.9) |
T2 | 567 (32.9) | 444 (34.4) | 26 (32.4) | 38 (25.3) | 59 (29.2) |
T3 | 631 (36.6) | 451 (35.0) | 33 (41.3) | 58 (38.3) | 89 (43.9) |
Mobile phone dependency trajectory | |||||
Group1 | 384 (22.3) | 305 (23.6) | 10 (12.7) | 40 (26.5) | 29 (14.3) |
Group2 | 1020 (59.2) | 766 (59.4) | 50 (63.3) | 84 (55.6) | 120 (59.1) |
Group3 | 319 (18.5) | 219 (17.0) | 19 (24.1) | 27 (17.9) | 54 (26.6) |