Table 4 Adjusted functional outcomes for the PSB and the PSB+ group.

From: Isolated lumbar extension exercise alone or in a multimodal program for low back pain and radiculopathy: a non-randomized controlled trial

Variables

Measurement period

PSB-only

n = 20

PSB + GT + IMT

n = 21

Main effect of group

Interaction effect between time and group

Strength 39° (Nm)

Baseline

173.71

173.71

p-value = 0.58

F = 0.31

df = 1

η2p = 0.008

p-value = 0.68

F = 0.57

df = 4

η2p = 0.06

3 weeks (std. err)

197.89 (7.53)

203.06 (7.34)

6 weeks

229.20 (9.66)

219.43 (9.42)

9 weeks

247.46 (10.56)

242.23 (10.30)

16 weeks

271.83 (13.44)

254.40 (13.11)

MD (95% CI)

98.12 (58.07 to 138.17)

80.69 (41.63 to 119.76)

Main effect of time

p-value < 0.001

p-value < 0.001

F = 13.91

F = 10.92

df = 4

df = 4

η2p = 0.61

η2p = 0.56

Strength 30° (Nm)

Baseline

175.24

175.24

p-value = 0.80

F = 0.07

df = 1

η2p = 0.002

p-value = 0.30

F = 1.26

df = 4

η2p = 0.13

3 weeks (std. err)

195.86 (9.36)

210.56 (9.13)

6 weeks

231.59 (11.67)

229.78 (11.39)

9 weeks

248.178 (12.40)

261.98 (12.09)

16 weeks

270.47 (15.06)

258.36 (14.70)

MD (95% CI)

95.22 (50.37 to 140.11)

83.12 (39.34 to 126.91)

Main effect of time

p-value < 0.001

p-value < 0.001

F = 11.46

F = 12.65

df = 4

df = 4

η2p = 0.58

η2p = 0.59

Strength 24° (Nm)

Baseline

181.93

181.93

p-value = 0.24

F = 1.41

df = 1

η2p = 0.04

p-value = 0.47

F = 0.90

df = 4

η2p = 0.09

3 weeks (std. err)

196.31 (11.54)

226.08 (11.26)

6 weeks

225.78 (12.44)

247.50 (12.13)

9 weeks

250.94 (11.73)

264.97 (11.45)

16 weeks

267.52 (14.56)

271.50 (14.21)

MD (95% CI)

85.59 (42.19 to 129.00)

89.58 (47.23 to 131.93)

Main effect of time

p-value < 0.001

p-value < 0.001

F = 10.48

F = 12.71

df = 4

df = 4

η2p = 0.55

η2p = 0.60

Strength 15° (Nm)

Baseline

168.54

168.54

p-value = 0.87

F = 0.03

df = 1

η2p = 0.001

p-value = 0.99

F = 0.08

df = 4

η2p = 0.01

3 weeks (std. err)

205.56 (12.51)

211.13 (12.20)

6 weeks

229.74 (14.21)

235.48 (13.85)

9 weeks

254.28 (14.09)

257.45 (13.74)

16 weeks

271.27 (15.49)

267.86 (15.10)

MD (95% CI)

102.73 (56.58 to 148.89)

99.35 (54.34 to 144.35)

Main effect of time

p-value < 0.001

p-value < 0.001

F = 11.25

F = 11.44

df = 4

df = 4

η2p = 0.56

η2p = 0.58

Strength

(all angles)

(Nm)

Baseline

174.85

174.85

p-value = 0.91

F = 0.01

df = 1

η2p = 0.0003

p-value = 0.68

F = 0.58

df = 4

η2p = 0.06

3 weeks (std. err)

200.37 (8.74)

211.32 (8.52)

6 weeks

230.60 (10.53)

231.59 (10.27)

9 weeks

251.70 (10.92)

255.23 (10.65)

16 weeks

271.64 (13.13)

261.74 (12.81)

MD (95% CI)

96.79 (57.64 to 135.93)

86.88 (48.70 to 125.06)

Main effect of time

p-value < 0.001

p-value < 0.001

F = 14.33

F = 14.04

df = 4

df = 4

η2p = 0.62

η2p = 0.62