Table 5 Intertester Reliability of the measurement of Area of the Transverse Abdominis muscle at three Lumbar levels at rest and during the hollowing maneuver

Level

Right

Left

Right

Left

Right

Left

Right

Left

L1

2.41 (0.66)

2.63 (0.97)

0.975

(0.948–0.990)

0.987

(0.973–0.995)

0.105

(2.21, 2.62)

0.110

(2.41, 2.84)

4.34

4.21

0.291

0.306

L3

2.12 (0.60)

2.16 (0.72)

0.982

(0.961–0.993)

0.984

(0.966–0.994)

0.081

(1.96, 2.28)

0.091

(1.98, 2.34)

3.80

4.23

0.223

0.253

L5

1.77 (0.45)

1.77 (0.66)

0.977

(0.951–0.991)

0.989

(0.976–0.996)

0.069

(1.63, 1.90)

0.070

(1.63, 1.90)

3.89

3.94

0.191

0.193

Average value (SD)

Right Mean (SD) cm²

Left Mean (SD) cm²

Level

Right

Left

Right

Left

Right

Left

Right

Left

L1

2.48 (0.92)

2.83 (1.25)

0.972

(0.940–0.989)

0.980

(0.958–0.992)

0.153

(2.18, 2.79)

0.177

(2.49, 3.18)

6.19

6.25

0.425

0.491

L3

2.10 (0.56)

2.40 (1.27)

0.972

(0.940–0.989)

0.988

(0.974–0.995)

0.093

(1.92, 2.28)

0.139

(2.13, 2.68)

4.45

5.77

0.259

0.384

L5

1.74 (0.58)

2.02 (1.01)

0.991

(0.980–0.996)

0.989

(0.977–0.996)

0.055

(1.63, 1.85)

0.201

(1.58, 2.37)

3.17

5.26

0.153

0.294

Average value (SD)