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Table 3 Inter-assessor intraclass correlation coefficients between assessments “B1” and “A2”

From: Isometric Strength Database for Muscle Maximal Voluntary Endurance Field Tests: Normative Data

Muscle isometric tests

B1 (sec.)

Mean ± SD

A2 (sec.)

Mean ± SD

Bias (sec.)

Mean ± SD

CV (%)

ICC

[95% CI]

95% LOA (sec.)

SEM (sec.)

SEM (%)

Lower

Upper

Trunk flexor muscles

145.2 ± 79.3

150.8 ± 78.9

−5.6 ± 10.2

5.1

0.995

[0.983‑0.998]

−25.66

14.46

0.72

0.50

Back extensor muscles

207.4 ± 81.9

211.8 ± 80.2

−4.5 ± 13.0

4.5

0.993

[0.982‑0.997]

−30.01

21.11

1.09

0.52

Right quadratus lumborum muscles

77.5 ± 36.0

82.6 ± 36.6

−5.1 ± 9.1

9.3

0.980

[0.937‑0.993]

−22.80

12.70

1.28

1.61

Left quadratus lumborum muscles

79.2 ± 32.5

83.6 ± 29.2

−4.4 ± 10.1

8.6

0.969

[0.916‑0.988]

−24.29

15.49

1.79

2.21

Quadriceps muscles

74.1 ± 27.8

77.3 ± 27.3

−3.2 ± 9.7

8.7

0.966

[0.914‑0.987]

−22.27

15.87

1.79

2.42

Hamstrings muscles

241.8 ± 114.3

245.6 ± 109.7

−3.9 ± 14.5

4.6

0.996

[0.989‑0.998]

−32.21

24.51

0.91

0.38

Back muscles

185.8 ± 80.6

186.6 ± 80.1

−0.8 ± 15.7

5.3

0.991

[0.977‑0.996]

−31.51

29.91

1.49

0.80

Chest muscles

74.2 ± 26.2

77.7 ± 23.7

−3.5 ± 13.9

11.8

0.915

[0.788‑0.966]

−30.81

23.81

4.06

5.37

  1. CV coefficient of variation, ICC intraclass correlation coefficients, CI confidence intervals, SEM standard error of measurement, LOA limits of agreement, sec. seconds, % percentage, SD standard deviation, B1 first assessment of assessor B, A2 second assessment of assessor A