Table 4 Descriptive values and linear mixed models statistics

PILE-test (kg)

Lower upper

IG

6.9 (6.5)

9.4 (5.1)

9.9 (5.8)

10.1 (5.2)

4.594 (1.587)

1.378 7.810

.006*

CG

3.7 (5.0)

2.0 (4.2)

10.4 (7.4)

5.1 (5.6)

Biering-Sørensen-Test (time)

IG

62.3 (30.0)

73.8 (50.3)

96.9 (64.5)

87.7 (38.6)

7.949 (9.866)

− 12.281 28.179

.427

CG

54.2 (35.0)

63.3 (53.4)

55.6 (47.6)

68.3 (43.3)

VAS (score)

IG

1.2 (1.6)

1.0 (1.7)

1.1 (1.7)

0.9 (1.6)

− 1.011 (0.482)

− 1.987 − 0.034

.043*

CG

2.1 (2.2)

2.7 (2.9)

2.2 (2.2)

1.1 (1.9)

ODI (%)

IG

7.8 (6.2)

6.6 (9.0)

5.0 (5.2)

6.5 (6.9)

− 4.577 (2.524)

− 9.688 0.533

.078

CG

12.8 (9.9)

10.5 (8.8)

11.5 (11.7)

11.8 (10.4)