Table 1. Test-retest reliability analysis (two-way mixed effects, absolute agreement) and Bland-Altman results
| Variable |
ICC3,1 |
95%CI |
Sig |
SEM |
Bias |
Relative bias (%) |
Lower LOA |
Upper LOA |
| Overall mean force (N) |
0.91 |
[0.85-0.95] |
0.00 |
7.81 |
9.71 (10.68) |
6.66 |
-11.23 |
30.64 |
| Max Force (N) |
0.93 |
[0.88-0.96] |
0.00 |
7.93 |
3.98 (11.15) |
2.25 |
-17.87 |
25.83 |
| Mean peak force (N) |
0.92 |
[0.86-0.96] |
0.00 |
8.31 |
9.18 (11.40) |
5.83 |
-13.16 |
31.51 |
| Inter-stroke range (N) |
0.85 |
[0.74-0.91] |
0.00 |
4.47 |
-0.13 (6.37) |
0.60 |
-12.62 |
12.36 |
| Mean stroke duration (s) |
0.38 |
[0.10-0.60] |
0.01 |
0.03 |
2.85x10-3 (0.04) |
0.06 |
-0.09 |
0.08 |
| Stroke duration variability (s) |
0.44 |
[0.18-0.65] |
0.00 |
0.05 |
-0.02 (0.07) |
18.17 |
-0.16 |
0.12 |
| Total number of strokes |
0.46 |
[0.20-0.66] |
0.00 |
1.31 |
-0.19 (1.84) |
1.03 |
-3.79 |
3.42 |
| Total impulse (Ns) |
0.88 |
[0.79-0.93] |
0.00 |
85.75 |
74.76 (121.84) |
5.41 |
-164.04 |
313.56 |
| Endurance index (%) |
0.74 |
[0.58-0.85] |
0.00 |
0.06 |
0.03 (0.08) |
3.57 |
-0.12 |
0.19 |
| Time to first peak (s) |
0.41 |
[0.14-0.62] |
0.01 |
0.12 |
0.03 (0.17) |
5.31 |
-0.29 |
0.36 |
| Rate of force development (N/s) |
0.25 |
[0.00-0.50] |
0.08 |
1335.5 |
532.8 (1895.7) |
32.84 |
-3182.9 |
4248.5 |
ICC = intra-class correlation, CI = confidence interval, Sig=significance level, SEM = standard error of measurement, LOA = limit of agreement, N = Newtons, s = seconds
