TABLE 2.

Risk of Future LBP Associated With Baseline Mechanical and Lifestyle Factors, Adjusted for Age and Gender

New Onset of LBPRR (95% CI) Adjusted for Age and Gender
YesNo
Average daily mechanical load—all children
 0–3.4 kg221171.0
 3.4–4.2 kg231201.1 (0.6–1.9)
 4.2–5.0 kg311171.4 (0.8–2.5)
 5.1–6.4 kg261181.2 (0.7–2.1)
 6.4–18 kg311241.2 (0.7–2.1)
Number of sporting activities per week (of >20 min)
 <5402091.0
 6–8361221.5 (0.95–2.4)
 9–11181450.7 (0.4–1.3)
 12–17321211.5 (0.9–2.3)
 >18421381.6 (1.1–2.7)
Time spent on physical education at school per week
 <100 min331551.0
 105–120 min612481.1 (0.7–1.7)
 122–135 min7271.2 (0.5–2.7)
 140–180 min341431.1 (0.7–1.8)
 >190 min271211.1 (0.6–1.8)
Time spent watching TV or playing computer games “yesterday”
 <120 min331341.0
 70–180 min371630.9 (0.6–1.5)
 125–183 min291231.0 (0.6–1.6)
 183–270 min331121.2 (0.7–1.9)
 >275 min271181.0 (0.6–1.8)