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Table 2 Baseline characteristics, baseline test results, and practice and game exposure during the follow up for players with and without LBP

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

 LBP during follow-upStudy year 2011–2012Study year 2012–2013Study year 2013–2014
nMeanSDP valuenMeanSDP valuenMeanSDP value
Age, yearsNo10616.21.70.00913816.72.00.65926616.12.00.109
Yes618.01.5 1016.32.2 3215.52.0 
Sex, % 10020.35.20.74312819.34.40.56922818.83.90.043
 FemaleNo8095.2  8592.4  10788.4  
Yes44.8  77.6  1411.6  
 MaleNo2692.9  5394.6  15989.8  
Yes27.1  35.4  1810.2  
Height, cmNo106170.48.50.138138173.29.10.609259174.29.40.929
Yes6175.810.9 10171.710.1 32174.17.7 
Weight, kgNo10663.89.80.64613866.910.50.12425966.311.00.598
Yes667.312.4 1062.18.4 3265.19.0 
BMINo10621.92.60.77613822.22.60.14025921.82.80.633
Yes621.62.0 1021.01.6 3221.42.1 
Sport, %
 BasketballNo5896.7 0.3075896.7 0.71713388.1 0.504
Yes266.7  23.3  1811.9  
 FloorballNo4892.3  8090.9  13390.5  
Yes47.7  89.1  149.5  
Nicotine use, %
 NoNo10394.5 0.67613493.7 0.23025789.9 0.103
Yes65.5  96.3  2910.1  
 YesNo3100.0  480.0  975.0  
Yes00.0  120.0  325.0  
Peak vGRF, N/kgNo10020.35.20.74312819.34.40.56922818.83.90.043
Yes519.74.2 618.03.7 2920.24.2 
Absolute Peak vGRF, NNo1001289.1392.30.7741281269.1357.40.2242281216.7321.30.122
Yes51316.5345.5 61077.4118.5 291298.2308.7 
Peak vGRF asymmetry, N/kgNo1002.52.00.5841282.01.80.4642282.11.80.641
Yes52.12.0 62.41.8 292.12.0 
Absolute Peak vGRF asymmetry, NNo100161.2131.60.662128131.1123.40.572228133.6119.40.735
Yes5143.5144.3 6143.195.9 29132.9125.8 
Left leg femur-pelvic angle, degreesNo8580.94.50.37510379.94.40.30320280.55.00.740
Yes678.95.4 779.17.2 2080.15.3 
Right leg femur-pelvic angle, degreesNo9177.54.90.9059576.94.50.58719977.14.70.033
Yes677.65.4 775.65.4 2274.64.9 
Team practice hours during the follow-up, mean hoursNo106238.1104.50.341138201.189.40.356266229.0114.60.923
Yes6279.677.7 10227.860.2 32227.0101.5 
Game hours during the follow-up, mean hoursNo1067.16.00.5971388.45.80.2472669.16.00.240
Yes65.84.8 1010.64.8 327.84.4 
  1. vGRF vertical ground reaction force, N newton, cm centimetres, kg kilograms, LBP low back pain, SD standard deviation
  2. Statistically significant results are indicated with bold