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Table 2 Features and thresholds adopted in the fall detection algorithms

From: Exploring smartphone sensors for fall detection

Feature Fall value Fall description Threshold
SV 23.45 Fall from a chair ending lying C sv =23
A V 18.53 Backward fall ending lying C a v =18
C A 66.33 Forward fall with arm protection ending lying C c a =65.5
VA 4.93 Fall from a chair ending lying C v a =4.72
VA 1.49 Backward fall ending lying \(C_{va}^{l_{1}}=1.48\)
OD 253.88 Forward fall with arm protection ending lying C o d =250
S V G 6.02 Backward fall ending lying C s v g =5.9
S V G A 111.21 Backward fall ending lying C s v g a =110