Table 2 Relative risk ratio (RRR) of spinal pain according to screen time and physical activity among the 45,555 pre-adolescents included in the study population (The Danish National Birth Cohort, born 1996–2003)

  < 2 h/day

Ref.

Ref.

Ref.

Ref.

Ref.

Ref.

 2 to < 4 h/day

1.25 (1.17–1.34)

1.30 (1.18–1.43)

1.24 (1.16–1.33)

1.28 (1.16–1.41)

1.23 (1.15–1.32)

1.24 (1.13–1.37)

 4 to < 6 h/day

1.49 (1.37–1.63)

1.64 (1.45–1.84)

1.47 (1.34–1.61)

1.59 (1.41–1.80)

1.43 (1.31–1.57)

1.49 (1.32–1.68)

  ≥ 6 h/day

1.80 (1.58–2.05)

2.89 (2.48–3.38)

1.76 (1.54–2.01)

2.77 (2.37–3.24)

1.69 (1.48–1.93)

2.49 (2.13–2.92)

  < 2 h/day

Ref.

Ref.

Ref.

Ref.

Ref.

Ref.

 2 to < 4 h/day

1.11 (1.02–1.22)

1.24 (1.07–1.43)

1.11 (1.01–1.21)

1.23 (1.06–1.41)

1.10 (1.01–1.20)

1.21 (1.05–1.39)

 4 to < 6 h/day

1.31 (1.19–1.44)

1.51 (1.29–1.76)

1.29 (1.17–1.41)

1.47 (1.26–1.71)

1.26 (1.15–1.39)

1.41 (1.20–1.64)

  ≥ 6 h/day

1.38 (1.23–1.55)

2.21 (1.87–2.62)

1.34 (1.19–1.50)

2.11 (1.78–2.51)

1.30 (1.16–1.46)

1.95 (1.65–2.32)

 Inactive

1.25 (1.16–1.33)

1.56 (1.42–1.71)

1.14 (1.06–1.22)

1.28 (1.16–1.41)

1.12 (1.04–1.20)

1.22 (1.10–1.34)

 Lightly active

1.14 (1.09–1.19)

1.20 (1.12–1.28)

1.11 (1.06–1.16)

1.12 (1.05–1.20)

1.09 (1.04–1.14)

1.09 (1.02–1.16)

 Moderately active

Ref.

Ref.

Ref.

Ref.

Ref.

Ref.

 Vigorously active

0.98 (0.88–1.09)

1.04 (0.90–1.21)

1.00 (0.90–1.11)

1.09 (0.94–1.26)

1.00 (0.90–1.11)

1.08 (0.93–1.26)