## 3 Results
### Assessment of Accuracy and Agreement for %BF, WC, and WHR
\begin{table}
\begin{tabular}{c c c c c} \hline  & **Total** & **Males** & **Females** & **\(p\)-Value** \\  & **n = 203** & **n = 76** & **n = 127** & **\(p\)-Value** \\ \hline Age (years) & 25.01 \(\pm\) 4.57 & 26.21 \(\pm\) 4.72 & 24.30 \(\pm\) 4.34 & \textless{}0.001 \\ \hline Anthropometrics & & & & \\ Height (m) & 1.73 \(\pm\) 0.09 & 1.81 \(\pm\) 0.06 & 1.67 \(\pm\) 0.06 & \textless{}0.001 \\ Weight (kg) & 68.94 \(\pm\) 12.56 & 80.44 \(\pm\) 10.18 & 62.06 \(\pm\) 7.98 & \textless{}0.001 \\ WC\({}_{\text{manual}}\) (cm) & 79.40 \(\pm\) 9.13 & 86.13 \(\pm\) 7.35 & 75.38 \(\pm\) 7.61 & \textless{}0.001 \\ WC\({}_{\text{BIA}}\) (cm) & 81.29 \(\pm\) 8.07 & 85.25 \(\pm\) 8.35 & 78.91 \(\pm\) 6.91 & \textless{}0.001 \\ _p_-Value & \textless{}0.001 & ns & \textless{}0.001 & \\ HC\({}_{\text{manual}}\) (cm) & 97.87 \(\pm\) 6.07 & 99.32 \(\pm\) 5.97 & 97.01 \(\pm\) 5.98 & 0.008 \\ \hline Indices & & & & \\ BMI (kg/m\({}^{2}\)) & 22.96 \(\pm\) 2.56 & 24.37 \(\pm\) 2.39 & 22.11 \(\pm\) 2.28 & \textless{}0.001 \\ BMI normal & 168 (83) & 50 (66) & 118 (93) & \textless{}0.001 \\ weight (\%) & & & & \\ BMI overweight & & & & \\ (\%) & 35 (17) & 26 (34) & 9 (7) & \\ WHR\({}_{\text{manual}}\) & 0.81 \(\pm\) 0.07 & 0.87 \(\pm\) 0.06 & 0.78 \(\pm\) 0.05 & \textless{}0.001 \\ WHR\({}_{\text{BIA}}\) & 0.84 \(\pm\) 0.05 & 0.85 \(\pm\) 0.06 & 0.84 \(\pm\) 0.04 & ns \\ _p_-Value & \textless{}0.001 & 0.028 & \textless{}0.001 & \\ WHR\({}_{\text{manual}}\) & 0.46 \(\pm\) 0.04 & 0.45 \(\pm\) 0.04 & 0.47 \(\pm\) 0.04 & \textless{}0.001 \\ WHR\({}_{\text{WC-BIA}}\) & 0.47 \(\pm\) 0.04 & 0.47 \(\pm\) 0.05 & 0.47 \(\pm\) 0.04 & ns \\ _p_-Value & \textless{}0.001 & ns & \textless{}0.001 & \\ \hline Body composition & & & & \\ \%BF\({}_{\text{BIA}}\) (\%) & 21.68 \(\pm\) 7.61 & 15.42 \(\pm\) 5.80 & 25.43 \(\pm\) 5.92 & \textless{}0.001 \\ \%BF\({}_{\text{ADP}}\) (\%) & 22.28 \(\pm\) 8.00 & 16.66 \(\pm\) 7.01 & 25.65 \(\pm\) 6.54 & \textless{}0.001 \\ _p_-Value & 0.015 & 0.002 & ns & \\ \%FFM\({}_{\text{BIA}}\) (\%) & 78.32 \(\pm\) 7.61 & 84.58 \(\pm\) 5.80 & 74.57 \(\pm\) 5.92 & \textless{}0.001 \\ \%FFM\({}_{\text{ADP}}\) (\%) & 77.72 \(\pm\) 8.00 & 83.34 \(\pm\) 7.01 & 74.35 \(\pm\) 6.54 & \textless{}0.001 \\ _p_-Value & 0.015 & 0.002 & ns & \\ VFA (cm\({}^{3}\)) & 62.06 \(\pm\) 27.40 & 52.30 \(\pm\) 26.36 & 67.90 \(\pm\) 26.42 & \textless{}0.001 \\ \hline \end{tabular} Mean and SD; WC, Waist circumference; HC, Hip circumference; BMI, Body mass index; WHR, Waist-to-hip ratio; WHR, Waist-to-height ratio; %BF, Body fat percentage; BIA, Bioelectrical impedance analysis; ADP, Air displacement plethysmography; %FFM, Fat-free mass percentage; VFA, Visceral fat area; ns, not statistically significant.  
\end{table} 
Table 2: Characteristics of the participants. was 6.5%, indicating a low agreement between ADP and BIA in the assessment of %BF in participants with BMI values indicating normal body weight. WC determined by the BIA method was statistically different from manual measurement for the total group and for females (for males, there are no statistical differences; the bias is small and equal to 0.874) (Table 4, Figure S2). The Bland-Altman plots revealed that InBody 770 overestimated WC for the total group, and for females, the bias is \(-1.886\) and \(-3.537\), respectively. In addition, the regression line indicates that bias for the total group was not distributed homogeneously (\(\beta=0.192\), \(p=0.006\)) along the entire range of average WC values. Considering sex, the regression line indicates that bias for males and females was not distributed homogeneously (for men: \(\beta=0.195\), \(p=0.091\); \(\beta=0.138\), \(p=0.121\)) along the entire range of average WC values. The mean WC determined by the BIA method in females was 78.9 cm and 85,3 cm in males, while by the manual method, it was 75.4 cm and 86.1 cm, respectively (Table 2). The mean difference in WC for the manual and BIA method was \(-1.886\) cm. LOA was from \(-13.400\) to \(9.627\) cm, and the Bland-Altman index