Table 1.

Mean absolute error of grip strength estimation models across different smartphone tasks.

Task	Random forest (kg), mean absolute error (SD)	Support vector machine (kg), mean absolute error (SD)	Gradient boosting (kg), mean absolute error (SD)	k-nearest neighbors (kg), mean absolute error (SD)
Tap	3.62 (0.24)	3.17 (0.20)	3.27 (0.29)	3.48 (0.29)
Flick	3.99 (0.23)	3.52 (0.17)	3.57 (0.20)	3.60 (0.34)
Drag	3.84 (0.31)	3.46 (0.26)	3.54 (0.31)	3.48 (0.24)
All	3.48 (0.21)	2.62 (0.18)	3.07 (0.28)	2.90 (0.12)