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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-up

Study year 2011–2012

Study year 2012–2013

Study year 2013–2014

n

Mean

SD

P value

n

Mean

SD

P value

n

Mean

SD

P value

Age, years

No

106

16.2

1.7

0.009

138

16.7

2.0

0.659

266

16.1

2.0

0.109

Yes

6

18.0

1.5

 

10

16.3

2.2

 

32

15.5

2.0

 

Sex, %

 

100

20.3

5.2

0.743

128

19.3

4.4

0.569

228

18.8

3.9

0.043

 Female

No

80

95.2

  

85

92.4

  

107

88.4

  

Yes

4

4.8

  

7

7.6

  

14

11.6

  

 Male

No

26

92.9

  

53

94.6

  

159

89.8

  

Yes

2

7.1

  

3

5.4

  

18

10.2

  

Height, cm

No

106

170.4

8.5

0.138

138

173.2

9.1

0.609

259

174.2

9.4

0.929

Yes

6

175.8

10.9

 

10

171.7

10.1

 

32

174.1

7.7

 

Weight, kg

No

106

63.8

9.8

0.646

138

66.9

10.5

0.124

259

66.3

11.0

0.598

Yes

6

67.3

12.4

 

10

62.1

8.4

 

32

65.1

9.0

 

BMI

No

106

21.9

2.6

0.776

138

22.2

2.6

0.140

259

21.8

2.8

0.633

Yes

6

21.6

2.0

 

10

21.0

1.6

 

32

21.4

2.1

 

Sport, %

 Basketball

No

58

96.7

 

0.307

58

96.7

 

0.717

133

88.1

 

0.504

Yes

2

66.7

  

2

3.3

  

18

11.9

  

 Floorball

No

48

92.3

  

80

90.9

  

133

90.5

  

Yes

4

7.7

  

8

9.1

  

14

9.5

  

Nicotine use, %

 No

No

103

94.5

 

0.676

134

93.7

 

0.230

257

89.9

 

0.103

Yes

6

5.5

  

9

6.3

  

29

10.1

  

 Yes

No

3

100.0

  

4

80.0

  

9

75.0

  

Yes

0

0.0

  

1

20.0

  

3

25.0

  

Peak vGRF, N/kg

No

100

20.3

5.2

0.743

128

19.3

4.4

0.569

228

18.8

3.9

0.043

Yes

5

19.7

4.2

 

6

18.0

3.7

 

29

20.2

4.2

 

Absolute Peak vGRF, N

No

100

1289.1

392.3

0.774

128

1269.1

357.4

0.224

228

1216.7

321.3

0.122

Yes

5

1316.5

345.5

 

6

1077.4

118.5

 

29

1298.2

308.7

 

Peak vGRF asymmetry, N/kg

No

100

2.5

2.0

0.584

128

2.0

1.8

0.464

228

2.1

1.8

0.641

Yes

5

2.1

2.0

 

6

2.4

1.8

 

29

2.1

2.0

 

Absolute Peak vGRF asymmetry, N

No

100

161.2

131.6

0.662

128

131.1

123.4

0.572

228

133.6

119.4

0.735

Yes

5

143.5

144.3

 

6

143.1

95.9

 

29

132.9

125.8

 

Left leg femur-pelvic angle, degrees

No

85

80.9

4.5

0.375

103

79.9

4.4

0.303

202

80.5

5.0

0.740

Yes

6

78.9

5.4

 

7

79.1

7.2

 

20

80.1

5.3

 

Right leg femur-pelvic angle, degrees

No

91

77.5

4.9

0.905

95

76.9

4.5

0.587

199

77.1

4.7

0.033

Yes

6

77.6

5.4

 

7

75.6

5.4

 

22

74.6

4.9

 

Team practice hours during the follow-up, mean hours

No

106

238.1

104.5

0.341

138

201.1

89.4

0.356

266

229.0

114.6

0.923

Yes

6

279.6

77.7

 

10

227.8

60.2

 

32

227.0

101.5

 

Game hours during the follow-up, mean hours

No

106

7.1

6.0

0.597

138

8.4

5.8

0.247

266

9.1

6.0

0.240

Yes

6

5.8

4.8

 

10

10.6

4.8

 

32

7.8

4.4

 
  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