Table 4.
Comparison of intraclass correlation coefficients for back extensor musculature between groups.
%HAT
Left
ULES
Right
ULES
Left
LLES
Right
LLES
Left
BF
Right
BF
Mean
p
100
Control
.80
.88
.94
.93
.94
.91
.90
.037
*
LBP
.74
.88
.85
.81
.72
.88
.81
110
Control
.81
.74
.92
.90
.95
.93
.88
.044
*
LBP
.60
.79
.75
.72
.83
.86
.76
120
Control
.88
.93
.97
.95
.98
.96
.95
.005
*
LBP
.57
.80
.73
.74
.88
.88
.77
130
Control
.85
.91
.96
.94
.98
.93
.93
.008
*
LBP
.37
.71
.63
.68
.86
.84
.68
140
Control
.89
.92
.96
.94
.98
.95
.94
.006
*
LBP
.46
.72
.57
.64
.89
.88
.69
150
Control
.89
.92
.97
.94
.98
.97
.95
.011
*
LBP
.03
.61
.33
.44
.88
.86
.53
160
Control
.87
.90
.90
.87
.98
.80
.89
.019
*
LBP
.21
.67
.67
.62
.66
.90
.62
170
Control
.84
.90
.95
.91
.98
.95
.92
.025
*
LBP
.45
.31
.67
.65
.92
.92
.65
MVIA
Control
.92
.96
.96
.93
.99
.96
.95
.021
*
LBP
.36
.52
.72
.72
.93
.94
.70
p
< .0001
†
.002
†
< .0001
†
< .0001
†
.001
†
.043
†
HAT: head, arms, trunk segment. LBP: Low back pain. ULES: Upper lumbar erector spinae. LLES: Lower lumbar erector spinae. BF: biceps femoris
* p ≤ 0.05 between LBP and Controls Groups for each % HAT.
† p ≤ 0.05 between LBP and Controls Groups for the specific muscle group in that column.