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Table 4 Association between peak vGRF measures and injury risk for all LBP and gradual onset non-traumatic LBP

From: Performance in dynamic movement tasks and occurrence of low back pain in youth floorball and basketball players

 UnivariateAdjusted
HR 95% CIP valueHR95% CIP value
Continuous variablesa
All LBP
  Peak vGRF, N/Kg1.03 (0.97 to 1.11)0.3401.03 (0.96 to 1.11)0.380
  Absolute Peak vGRF, N1.00 (1.00 to 1.00)0.7601.00 (1.00 to 1.00)0.870
  Peak vGRF asymmetry, N/Kg1.00 (0.85 to 1.18)0.9901.00 (0.85 to 1.18)0.990
  Absolute Peak vGRF asymmetry, N1.00 (1.00 to 1.00)0.9701.00 (1.00 to 1.00)0.940
Gradual onset non-traumatic LBP
  Peak vGRF, N/Kg1.00 (1.00 to 1.00)0.6101.00 (1.00 to 1.00)0.690
  Absolute Peak vGRF, N1.04 (0.96 to 1.12)0.3701.03 (0.96 to 1.12)0.420
  Peak vGRF asymmetry, N/Kg1.03 (0.87 to 1.23)0.7201.02 (0.86 to 1.22)0.810
  Absolute Peak vGRF asymmetry, N1.00 (1.00 to 1.00)0.7101.00 (1.00 to 1.00)0.790
Dichotomous variablesb(high vs. low)
All LBP
  Peak vGRF, N/Kg1.92 (1.00 to 3.68)0.0511.83 (0.95 to 3.51)0.070
  Absolute Peak vGRF, N0.99 (0.53 to 1.83)0.9600.94 (0.51 to 1.76)0.860
  Peak vGRF asymmetry, N/Kg1.23 (0.66 to 2.30)0.5101.22 (0.65 to 2.27)0.530
  Absolute Peak vGRF asymmetry, N1.21 (0.65 to 2.25)0.5501.20 (0.64 to 2.23)0.580
Gradual onset non-traumatic LBP
  Peak vGRF, N/Kg1.47 (0.73 to 2.98)0.6101.41 (0.69 to 2.86)0.340
  Absolute Peak vGRF, N0.98 (0.49 to 1.97)0.3700.94 (0.47 to 1.88)0.850
  Peak vGRF asymmetry, N/Kg1.31 (0.65 to 2.64)0.7201.30 (0.64 to 2.61)0.470
  Absolute Peak vGRF asymmetry, N1.28 (0.64 to 2.58)0.7101.26 (0.63 to 2.54)0.510
  1. HR Hazard ratio, CI confidence interval, LBP low back pain, vGRF vertical ground reaction force, N Newton;
  2. aAdjusted with history of LBP, leg dominance and nicotine use
  3. b All LBP: Adjusted with history of LBP and leg dominance. Gradual onset LBP: Adjusted with history of LBP
  4. Peak vGRF high > = 18.5, low< 18.5
  5. Absolute Peak vGRF high > = 1191.0, low< 1191.0
  6. Peak vGRF asymmetry high > = 1.6, low< 1.6
  7. Absolute Peak vGRF asymmetry high > = 103.3, low< 103.3
  8. Statistically significant results are indicated with bold