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Table 4 Mean standard deviations (SD) of each algorithm variable across subjects for both left and right ears as a representation of ear variability across subjects, with analysis of sensitivity based on different variable combinations

From: Ear biometrics for patient identification in global health: a cross-sectional study to test the feasibility of a simplified algorithm

Left ear algorithm Right ear algorithm
Variable N Mean SD Variable N Mean SD
CR1 25 0.038 CR1 25 0.039
CR2 25 0.050 CR2 25 0.044
CR3 25 0.064 CR3 25 0.053
CR4 25 0.066 CR4 25 0.067
CR5 25 0.071 CR5 25 0.075
CR6 25 0.063 CR6 25 0.073
CR7 25 0.054 CR7 25 0.064
I1 25 0.204 I1 25 0.191
I2 25 0.886 I2 25 0.418
I3 25 1.205 I3 25 0.888
O1 25 0.353 O1 25 0.248
O2 25 0.073 O2 25 0.069
O3 25 0.080 O3 25 0.073
  Mean 0.247   Mean 0.177
   Overall mean SD = 0.212    
Excluding I2 and I3 Mean 0.102   Mean 0.091
   Overall mean SD = 0.096    
Excluding I1, I2, I3, and O1 Mean 0.062   Mean 0.062
   Overall mean SD = 0.062    
Curvature only (C R 1C R 7) Mean 0.058   Mean 0.059
   Overall mean SD = 0.059