Table 1.

General description of included studies.

Authors and Year	Study Design	BIA Device and PhA Equation	Scientific Evidence
Curvello-Silva et al., 2020 [8]	Cross-sectional study	(a)DSM-BIA INBODY 720®; (b)PhA = arctan Xc/R.	C
Barrea et al., 2019 [9]	Cross-sectional study	(a)BIA 101 RJL; (b)PhA = arctangent Xc/R ((Xc/R) × (180/π)).	C
Shin et al., 2017 [10]	Retrospective observational study	(a)InBody S10, Biospace; (b)NR.	C
Fernández-Jiménez et al., 2022 [11]	Retrospective observational study	(a)BIA 101 RJL; (b)PhA = arctangent (Xc/R) × (180/π).	C
Abe et al., 2021 [12]	Observational cohort study	(a)InBody S10, Biospace; (b)PhA = arctangent (Xc/R).	B
Shin et al., 2022 [13]	Retrospective observational study	(a)InBody S10, Biospace; (b)PhA = arctangent (Xc/R) × (180/π).	B
Han et al., 2018 [14]	Cross-sectional study	(a)BIS BCM; (b)NR.	C
Han et al., 2019 [15]	Retrospective observational study	(a)BIS BCM; (b)NR.	B
Silva et al., 2018 [16]	Prospective cohort study	(a)Biodynamics 450® analyzer; (b)NR.	B
de Oliveira-Filho et al., 2020 [17]	Cross-sectional study	(a)Tetrapolar device Quantum II, RJL system; (b)NR.	C
Jun et al., 2021 [18]	Multicenter clinical study	(a)InBody S10; (b)PhAf,WB = sin−1((Xf,RA + Xf,TR + Xf,RL)/(Zf,RA + Zf,TR + Zf,RL)).	B
Chen et al., 2020 [19]	Cross-sectional study	(a)InBody 770; (b)PhA = arctangent (Xc/R) × (180/π).	C
Fu et al., 2022 [20]	Observational retrospective study	(a)Inbody 770; (b)PhA = arctangent (Xc/R) × (180/π).	C
Streb et al., 2020 [21]	Cross-sectional study	(a)InBody® 720 model; (b)PhA = arctangent (Xc/R) × (180/π).	C
Ferreira et al., 2018 [22]	Cross-sectional study	(a)Biodynamics BIA-450 body fat analyzer; (b)NR.	C
Sarmento-Dias et al., 2017 [23]	Cross-sectional study	(a)Multifrequency BIA using Inbody S10; (b)NR.	C

Abbreviations: PhA: phase angle, NR: not reported, Xc: reactance, R: resistance, BCM: Body Composition Monitor^TM. Scientific evidence according to GRADE scale: High = A, Moderate = B, Low = C, and Very Low = D.