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Table 1 Characteristics for participants (adults and adolescents)

From: Are MRI-defined fat infiltrations in the multifidus muscles associated with low back pain?

 

Adults

Adolescents

   

Men

Women

  

Variables

n

(%)

(%)

(%)

n

(%)

Sex

      

   Male

199

(48)

--

--

205

(47)

   Female

213

(52)

--

--

234

(53)

LBP variables

      

   LBP month

--

--

  

98

(22)

   LBP year

289

(70)

(70)

(70)

182

(41)

   LBP ever

352

(85)

(85)

(85)

--

--

Fat infiltration in LMM in at least one level

      

   Grade 0 (none)

78

(19)

(29)

(10)

379

(86)

   Grade 1 (slight)

293

(71)

(63)

(79)

60

(14)

   Grade 2 (severe)

41

(10)

(9)

(11)

0

(0)

Body weight

      

   Normal

234

(57)

(46)

(68)

369

(84)

   Overweight

131

(32)

(47)

(18)

56

(13)

   Obese

44

(11)

(8)

(14)

11

(3)

Workload

      

   Sedentary

89

(22)

(20)

(24)

--

--

   Sedentary/walking

144

(35)

(30)

(40)

--

--

   Light physical

92

(22)

(19)

(26)

--

--

   Heavy physical

84

(21)

(31)

(11)

--

--

Physical activity

      

   Not active

59

(14)

(12)

(17)

--

--

   Walking/cycling >4 hours

204

(50)

(48)

(51)

--

--

   Active sports >3 hours

140

(34)

(38)

(31)

--

--

   Competitive sports

9

(2)

(3)

(2)

--

--

Weekly hours of sports activity

      

   <2

91

(22)

(27)

(18)

117

(27)

   2 – 4

107

(26)

(23)

(29)

120

(27)

   4 – 6

103

(25)

(24)

(26)

97

(22)

   >6

111

(27)

(27)

(27)

92

(19)

Daily bicycling

      

   Not every day

--

--

--

--

66

(15)

   Every day

--

--

--

--

370

(85)

  1. LBP, lower back pain; LMM, lumbar multifidus muscles.