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Table 3 Mean standard deviations (SD) of investigators’ measurements for each algorithm variable for both left and right ears to represent measurement accuracy, 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 0.006 CR1 25 0.008
CR2 25 0.008 CR2 25 0.011
CR3 25 0.005 CR3 25 0.011
CR4 25 0.006 CR4 25 0.012
CR5 25 0.007 CR5 25 0.011
CR6 25 0.006 CR6 25 0.011
CR7 25 0.011 CR7 25 0.011
I1 25 0.035 I1 25 0.030
I2 25 0.127 I2 25 0.095
I3 25 0.120 I3 25 0.129
O1 25 0.061 O1 25 0.093
O2 25 0.007 O2 25 0.013
O3 25 0.012 O3 25 0.026
  Mean 0.032   Mean 0.036
   Overall mean SD = 0.034   
Excluding I2 and I3 Mean 0.015   Mean 0.022
  Overall mean SD = 0.034   
Excluding I1, I2, I3, and O1 Mean 0.008   Mean 0.013
  Overall mean SD = 0.010   
Curvature only (C R 1C R 7) Mean 0.007   Mean 0.011
  Overall mean SD = 0.009