# Intermonitor Variability of Garmin Vivofit(r) Jr. Wristband
## 3 Results  
Table 1 shows the mean number of steps and minutes of PA for all wristbands. Table 1 indicates that the highest mean values of the number of steps correspond to wristband 6, and the lowest to wristband 3; while for the variable minutes in MVPA, the highest corresponds to wristband 4, and the lowest to wristband 3. In this line, the maximum average difference in steps for wristbands on the same side corresponds to wristband 2 with wristband 3, with this difference being close to 5 steps. Similarly, wristbands 2 and 3 show the maximum average difference in the comparison between the wristbands on the same side, with a difference of 0.20 min in MVPA. The mean values between body sides were similar for both variables. Table 2 presents the mean difference, Spearman correlation coefficient, and [PERSON]'s concordance correlation coefficient for the variable's steps and minutes in MVPA for each wristband. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & \multicolumn{2}{c}{**Steps**} & \multicolumn{2}{c}{**Minutes in MVPA**} \\ \cline{2-5}  & **Mean Diff** & \(\mathbf{r_{s}}\) & **CCC** & **Mean Diff** & \(\mathbf{r_{s}}\) & **CCC** \\ \hline Wristband 1 vs. 2 & \(-\)4.30 & 1.000 & 0.993 & \(-\)0.03 & 0.921 & 0.917 \\ Wristband 1 vs. 3 & 0.90 & 1.000 & 0.996 & 0.07 & 0.973 & 0.888 \\ Wristband 2 vs. 3 & 5.20 & 1.000 & 0.991 & 0.10 & 0.892 & 0.917 \\ Wristband 4 vs. 5 & \(-\)1.90 & 1.000 & 0.998 & 0.03 & 0.975 & 0.990 \\ Wristband 4 vs. 6 & \(-\)5.17 & 1.000 & 0.990 & 0.03 & 1.000 & 0.966 \\ Wristband 5 vs. 6 & \(-\)3.27 & 1.000 & 0.994 & 0.00 & 0.975 & 0.976 \\ \hline \hline \end{tabular} Note. Abbreviations; Mean Diff = difference between mean values, \(\mathbf{r_{s_{+}}}\) [PERSON]’s correlation coefficient, CCC = [PERSON]’s concordance correlation coefficient, % Cv = coefficients of variations express in percentage.  
\end{table} 
Table 2: Mean difference, [PERSON]’s correlation coefficient (95% CI), and [PERSON]’s concordance correlation coefficient (95% CI) for both variables. In Table 2, the coefficients of [PERSON]'s correlation show a perfect correlation between wristbands in the variable's steps and an almost perfect correlation in all wristbands except in the association between wristbands 2 and 3 (very high correlation). [PERSON]'s concordance correlation coefficients indicate perfect concordance between Wristband 1 vs. 2, Wristband 1 vs. 3, Wristband 2 vs. 3, Wristband 4 vs. 5, and Wristband 5 vs. 6, only indicate a substantial concordance between Wristband 4 vs. 6 for the variable steps (Table 2). Following this line, substantial concordance was found between wrist bands 4 and 5, wrist bands 4 and 6, and wrist bands 5 and 6 in the variable minutes in MVPA. However, moderate concordance showed the coefficients between Wristband 1 vs. 2 and Wristband 2 vs. 3, and near moderate concordance for Wristband 1 vs. 3 in the variable minutes in MVPA. The results in Table 2 indicate that among wristbands worn on the same arm (non-dominant and dominant side), there are optimal correlation and concordance values for both steps and minutes in MVPA variables. Table 3 shows the CCI values corresponding to the 95% CI between the wristbands. In Table 3, the measures of steps and minutes of PA between the wristbands showed good to excellent agreement based on the CCI values (\(p<0.001\)). Consistent with previous correlation tests, the results continue along the same lines as those found in Table 2.  
In Figures 1 and 2, Bland-Altman plots indicate the differences between the wristbands concerning the number of steps, and the limits of agreement can be seen. Figures 1 and 2 show the differences between the wristbands and the limits of agreement of the wristbands concerning the steps. Systematic differences (mean differences) and the interval between the upper and lower limits of agreement are essential in determining the validity of the wristbands. The larger the interval between the upper and lower limits, the less accurate the measurements. All wristbands showed wide limits of agreement.