Table 2 Comparison of health behaviours in adolescents in study 1 versus study 2, using multivariable modelling

 Meeting PA guidelines (≥60 min MVPA/day) (%)

16.7%

23.1%

<0.001

 MVPA 60+ min/day (days/week)

4.1 ± 2.1

4.5 ± 2.0

<0.001

 Sport participation at school (%)

67.2%

65.1%

0.475

 Sport participation outside school (%)

50.2%

48.1%

0.437

 Meeting screen time guidelines (≤2 hrs/day) (%)

13.3%

18.3%

<0.001

 Watching television (including videos and DVDs) (hrs/day)

2.0 ± 1.7

1.8 ± 1.7

0.001

 Playing games on a computer or games console (hrs/day)

1.3 ± 1.8

1.5 ± 1.9

0.489

 Using a computer for chatting on-line, internet, emailing, homework, etc. (hrs/day)

2.7 ± 2.1

2.1 ± 1.9

<0.001

 Weekday average (hrs/day)

5.0 ± 2.9

4.6 ± 2.9

<0.001

 Weekend average (hrs/day)

6.9 ± 3.5

6.1 ± 3.6

<0.001

 Daily average screen time (hrs/day)

5.6 ± 3.0

5.0 ± 3.0

<0.001

 Meeting fruit and vegetable guidelines (more than once a day for both fruit and vegetables) (%)

29.6%

27.0%

0.322

 Once a week or less (Ref.)

8.9%

10.6%

 2-4 times per week

16.7%

18.7%

0.844

 5 or more times per week

74.3%

70.7%

0.400

 Once a week or less (Ref.)

4.8%

5.4%

 2-4 times per week

12.2%

9.6%

0.099

 5 or more times per week

82.9%

85.0%

0.709

 Once a week or less (Ref.)

42.6%

33.3%

 2-4 times per week

35.5%

41.6%

<0.001

 5 or more times per week

21.9%

25.0%

0.003

 Once a week or less (Ref.)

56.6%

70.0%

 2-4 times per week

25.4%

18.3%

<0.001

 5 or more times per week

17.9%

11.7%

<0.001

 Once a week or less (Ref.)

82.3%

85.3%

 2-4 times per week

12.6%

10.6%

0.037

 5 or more times per week

5.1%

4.0%

0.089