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)
| Model 1ab | Model 2bc | Model 3bd | |||||
|---|---|---|---|---|---|---|---|
| No. of cases Moderate/Severe | Moderate pain RRR (95% CI) | Severe pain RRR (95% CI) | Moderate pain RRR (95% CI) | Severe pain RRR (95% CI) | Moderate pain RRR (95% CI) | Severe pain RRR (95% CI) | |
| Screen time, girls | |||||||
| < 2 h/day | 1734/728 | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
| 2 to < 4 h/day | 3651/1584 | 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 | 1372/631 | 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 | 493/332 | 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) |
| Screen time, boys | |||||||
| < 2 h/day | 973/283 | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
| 2 to < 4 h/day | 2856/922 | 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 | 1652/553 | 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 | 761/355 | 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) |
| Physical activity behavior | |||||||
| Inactive | 1627/769 | 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 | 6225/2474 | 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 | 5066/1914 | Ref. | Ref. | Ref. | Ref. | Ref. | Ref. |
| Vigorously active | 574/231 | 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) |
a Crude model (Screen time was analyzed as the interaction between screen time and child’s sex)
b Reference categories: For explanatory variables; less than 2 h of daily screen time and being physically active, and for outcome variables; not having reported moderate or severe spinal pain in DNBC-11 (No pain)
c Simultaneously modelled for the interaction between screen time and child’s sex, and physical activity behavior, but without further adjustments
d Adjusted for child’s age, parity, family type, parental education, household income and simultaneously modelled for the interaction between screen time and child’s sex, and physical activity behavior