Table 1 Symptom and activity scores in 5^th and 10^th grade

Reading symptom score*^#

8.2 ± 2.7

6.7 ± 1.9

9.2 ± 3.4

8.2 ± 3.1

Upper body musculoskeletal symptom score*^#

7.7 ± 2.8

6.7 ± 2.1

8.9 ± 3.0

8.0 ± 3.2

Screen use symptoms (tablet)

Tired eyes*^#

2.3 ± 1.0

1.5 ± 0.7

2.4 ± 1.0

1.9 ± 0.9

Reflections / Glare*^#

2.6 ± 1.2

2.1 ± 1.1

3.2 ± 0.9

2.9 ± 1.1

Difficulties with distance vision^#

2.1 ± 0.9

1.8 ± 1.2

2.0 ± 1.1

1.7 ± 1.0

Reading on paper*^#

4.2 ± 1.1

4.1 ±1.1

3.9 ± 1.4

3.4 ± 1.1

Screen time

Total*

21.2 ± 4.4

22.2 ± 4.7

26.6 ± 5.2

25.7 ± 4.9

School work (tablet)*^#

4.6 ± 1.0

4.4 ± 1.1

8.9 ± 1.3

5.4 ± 1.4

Outdoor*

14.4 ± 3.0

15.0 ± 3.3

13.3 ± 3.8

12.1 ± 4.0

Physical activity

Total

14.1 ± 3.3

16.0 ± 3.6

15.0 ± 4.3

13.6 ± 4.1

Sports

8.7 ± 2.6

10.7 ± 2.5

10.1 ± 3.3

9.0 ± 3.1

Walking / cycling to school*

n (%)

21 (78)

20 (83)

44 (59)

35 (53)

Physical active School breaks*

n (%)

26 (96)

23 (96)

5 (7)

7 (11)