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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