Table 2. Standard deviations (SDs) and ranges of relative differences (RDs) for the Planimator app and other methods or devices used in the comparison.

Data necessary for the REs calculations are given in the S1 Table.

Method or device	SDs of RDsa	Range of RDsa
Visitrak	8.92%	-28.7%–0.7%
SilhouetteMobile	5.83%	-28.7%–4.2%
AreaMe	3.54%	-13.4%–0.1%
Smartphone camera	0.75%	-1.7%–1.2%
Compact camera	0.59%	-1.4%–1.3%
D-SLR camera	0.58%	-1.6%–1.2%
Planimatorb	0.52%	-1.6%–0.5%

^a From N = 40 values for each method or device.

^b The app was installed at Samsung Galaxy S4.