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Table 2 Intra-assessor intraclass correlation coefficients

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

Muscle isometric tests

B1 (sec.)

Mean ± SD

B2 (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

146.0 ± 79.1

−0.8 ± 20.1

9.1

0.984

[0.961‑0.994]

−40.15

38.65

2.54

1.75

Back extensor muscles

207.4 ± 81.9

210.9 ± 71.9

−3.5 ± 26.9

8.9

0.970

[0.924‑0.988]

−56.27

49.27

4.66

2.23

Right quadratus lumborum muscles

77.5 ± 36.0

81.4 ± 36.4

−3.9 ± 14.7

11.3

0.956

[0.891‑0.983]

−32.71

24.91

3.08

3.88

Left quadratus lumborum muscles

79.2 ± 32.5

82.8 ± 30.6

−3.6 ± 12.9

11.1

0.955

[0.889‑0.982]

−28.85

21.65

2.73

3.37

Quadriceps muscles

74.1 ± 27.8

74.5 ± 31.2

−0.4 ± 11.9

10.3

0.959

[0.897‑0.984]

−23.84

22.94

2.42

3.25

Hamstrings muscles

241.8 ± 114.3

242.2 ± 112.6

−0.5 ± 24.3

6.6

0.989

[0.972‑0.996]

−48.11

47.21

2.55

1.05

Back muscles

185.8 ± 80.6

184.8 ± 75.5

1.0 ± 19.0

6.9

0.986

[0.964‑0.994]

−36.18

38.18

2.24

1.21

Chest muscles

74.2 ± 26.2

77.1 ± 27.6

−2.9 ± 12.1

10.5

0.946

[0.866‑0.978]

−26.69

20.89

2.82

3.73

  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, B2 second assessment of assessor B