Table 1.
Participant characteristics at baseline.
| Participant characteristics | Total (n=756) | Intervention (n=377) | Control (n=379) | ||||
| Age (years), median (IQR) | 17 (16-18) | 17 (16-18) | 17 (16-18) | ||||
| Sex, n (%) | |||||||
|
|
Female | 520 (69) | 265 (70) | 255 (67) | |||
|
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Male | 236 (31) | 112 (30) | 124 (33) | |||
| Economy, n (%) | |||||||
|
|
Very good | 246 (33) | 112 (30) | 134 (35) | |||
|
|
Average | 447 (59) | 232 (62) | 215 (57) | |||
|
|
Not so good | 56 (7) | 30 (8) | 26 (7) | |||
|
|
Not good at all | 7 (1) | 3 (1) | 4 (1) | |||
| Parents educationa, n (%) | |||||||
|
|
Primary | 52 (7) | 25 (7) | 27 (7) | |||
|
|
Secondary | 261 (35) | 131 (35) | 130 (34) | |||
|
|
Tertiary | 443 (59) | 221 (59) | 222 (59) | |||
| Region of birthb, n (%) | |||||||
|
|
Sweden | 648 (86) | 324 (86) | 324 (85) | |||
|
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Other | 108 (14) | 53 (14) | 55 (15) | |||
| Parents’ region of birthb, n (%) | |||||||
|
|
Sweden | 546 (72) | 268 (71) | 278 (73) | |||
|
|
Other | 210 (28) | 109 (29) | 101 (27) | |||
| Satisfaction with lifec, median (IQR) | 7 (6-8) | 7 (6-8) | 7 (6-8) | ||||
| Psychosocial variablesd, median (IQR) | |||||||
|
|
Importance | 7 (5-9) | 7 (5-9) | 7 (5-9) | |||
|
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Confidence | 6 (5-8) | 6 (5-8) | 6 (5-8) | |||
|
|
Know-how | 6 (5-8) | 6 (5-8) | 6 (4-8) | |||
| Primary outcomes | |||||||
|
|
Number of weekly standard drinks (12 g pure alcohol) consumede, median (IQR) | 12.5 (10-15.8) | 12.5 (10.3-15) | 13 (10-17.8) | |||
|
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Monthly frequency of heavy episodic drinking (ie, ≥ 4 standard drinks)e, median (IQR) | 2 (1-3) | 2 (1-3) | 2 (1-3) | |||
|
|
Number of daily portions (100 g) of fruit and vegetables consumede, median (IQR) | 1 (0.7-1.8) | 1 (0.7-2) | 1 (0.7-2) | |||
|
|
Number of weekly sugary drinks (33 cl) consumede, median (IQR) | 5 (2-7) | 2 (2-5) | 5 (2-7) | |||
|
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Weekly time spent in MVPAf (minutes)e, median (IQR) | 135 (60-240) | 165 (60-240) | 135 (45-240) | |||
|
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Smoking any cigarette in the past weeke, n (%) | 140 (19) | 68 (18) | 72 (19) | |||
| Secondary outcomes, median (IQR) | |||||||
|
|
Number of weekly portions of candy or snacks | 2 (2-5) | 2 (2-5) | 2 (2-5) | |||
|
|
BMI (kg/m2)g | 21.9 (19.7-24.6) | 21.9 (19.7-24.4) | 21.9 (19.8-24.8) | |||
|
|
Number of cigarettes smoked weekly among smokers | 7 (2-34.3) | 5.5 (1.8-30.5) | 9.5 (2-35.3) | |||
aAssessed as “Please select the highest education for your mother and father.”
bAssessed as “Where were you/your parents born?”
cCantril’s ladder [64] “Thinking about your own life and personal circumstances, how satisfied are you with your life as a whole?” responded on a 11-point Likert scale where 0 represent not at all satisfied.
dDefined as follows: Importance: “How important do you think it is to improve your lifestyle or sustain your healthy behaviors?”; Confidence: “How confident are you that you will be able to change your lifestyle or sustain your healthy behaviors?”; Know-how: “How well do you know how to change your lifestyle?”; all items responded on a 10-point Likert scale.
eAmong participants at-risk for the behavior at baseline (weekly alcohol consumption, n=46, heavy episodic drinking, n=338, fruit and vegetables, n=738, sugary drinks, n=469, moderate to vigorous physical activity n=527, and cigarette smoking, n=140).
fMVPA: moderate to vigorous physical activity.
gCalculated by asking participants at baseline about their height (in cm, numerical measure) and weight (in kg, numerical measure) to determine their BMI.