Sociodemographic characteristics of study participants (13–19 years) at baseline (N=1295)
| Characteristics | Males (N=228) | Females (N=1045) | Total (N=1295)* |
| Age | |||
| Median (IQR) | 17 (16–18) | 17 (16–18) | 17(16–18) |
| BMI | |||
| Median (IQR) | 22.2 (19.84–25.04) | 22.04 (19.92–24.98) | 22.07 (19.95–25.1) |
| BMI category | |||
| Underweight | 12 (5.43) | 88 (8.72) | 100 (8.08) |
| Normal | 137 (61.99) | 635 (62.93) | 775 (62.6) |
| Overweight | 57 (25.79) | 185 (18.33) | 245 (19.79) |
| Obese | 15 (6.79) | 101 (10.01) | 118 (9.53) |
| Year of school | |||
| Year 7 | 1 (0.44) | 1 (0.1) | 2 (0.15) |
| Year 8 | 11 (4.82) | 19 (1.82) | 30 (2.32) |
| Year 9 | 22 (9.65) | 51 (4.88) | 74 (5.71) |
| Year 10 | 34 (14.91) | 125 (11.96) | 162 (12.51) |
| Year 11 | 20 (8.77) | 79 (7.56) | 101 (7.8) |
| Year 12 | 50 (21.93) | 223 (21.34) | 280 (21.62) |
| Not at school | 9 (3.95) | 37 (3.54) | 47 (3.63) |
| Finished school | 81 (35.53) | 510 (48.8) | 599 (46.25) |
| Trade certificate | |||
| No | 76 (84.44) | 441 (80.77) | 525 (81.4) |
| Yes | 14 (15.56) | 105 (19.23) | 120 (18.6) |
| Work at a job | |||
| No | 117 (51.77) | 411 (39.48) | 539 (41.82) |
| Yes | 109 (48.23) | 630 (60.52) | 750 (58.18) |
| Looking for a job | |||
| No | 59 (50.43) | 156 (37.96) | 220 (40.82) |
| Yes | 58 (49.57) | 255 (62.04) | 319 (59.18) |
| Work for salary | |||
| No | 18 (16.51) | 57 (9.05) | 78 (10.4) |
| Yes | 91 (83.49) | 573 (90.95) | 672 (89.6) |
| Weekly work hours | |||
| Median (IQR) | 10 (6–16) | 12 (7–20) | 12 (7–20) |
| Language at home | |||
| English | 187 (82.02) | 891 (85.43) | 1097 (84.84) |
| Other | 41 (17.98) | 152 (14.57) | 196 (15.16) |
| Socioeconomic status | |||
| 5 least disadvantaged | 45 (37.82) | 170 (32.76) | 220 (33.69) |
| 4 | 25 (21.01) | 97 (18.69) | 126 (19.3) |
| 3 | 11 (9.24) | 89 (17.15) | 100 (15.31) |
| 2 | 23 (19.33) | 75 (14.45) | 99 (15.16) |
| 1 most disadvantaged | 15 (12.61) | 88 (16.96) | 108 (16.54) |
*Gender other than male and female was not presented separately in the table and the totals of male and female are therefore not equal to the total. Additionally, each variable may present missing values and some variables may not be applicable for certain groups (eg, ‘work for salary’ was only applicable to those who reported having a job).
BMI, body mass index.