Table 3

Main effects of Time and Group and their interaction effect on primary and secondary outcome measures (CI=95%,) *
Outcome measure Effects df F P value
FRI** Time 2 75.92 <.001*
Group 1 3.90 .004*
Time*Group 2 1.03 .31
VAS** Time 2 80.11 <0.001*
Group 1 .00 .48
Time*Group 2 .514 .98
Lumbar flexion Time 2 3.47 .09
Group 1 3.16 .02*
Time*Group 2 1.48 .23
Lumbar extension Time 2 1.53 .11
Group 1 4.12 .03*
Time*Group 2 1.61 .21
Endurance time Time 2 0.63 .43
Group 1 3.05 .05*
Time*Group 2 1.99 .17
Right Illiocostalis Lumborum Time 2 .39 .53
Group 1 .01 .93
Time*Group 2 .52 .41
Right Multifidus Time 2 .06 .16
Group 1 .16 .69
Time*Group 2 .52 .48
Right Gluteus Maximus Time 2 3.41 .73
Group 1 .02 .89
Time*Group 2 .52 .47
Right Biceps Femoris Time 2 5.38 .86
Group 1 .02 .79
Time*Group 2 .05 .82

Left Iliocostalis

Lumborum

Time 2 3.65 .06
Group 1 .87 .35
Time*Group 2 .38 .54
Left Multifidus Time 2 1.49 .23
Group 1 .14 .71
Time*Group 2 1.22 .27
Left Gluteus Maximus Time 2 .98 .33
Group 1 .95 .33
Time*Group 2 .86 .36

*The effect of the US versus placebo US on outcome measures was analyzed using a Group (US and placebo US) × Time (Pre, Post, and follow-up) mixed model ANOVA at significance level ≤ .05.

**FRI: Functional Rating Index, VAS: Visual Analog Scale.

Ebadi et al.

Ebadi et al. BMC Musculoskeletal Disorders 2012 13:192   doi:10.1186/1471-2474-13-192

Open Data