Skip to main content

Table 3 Important features for classifying frailty in the whole population and relative to each subgroup

From: Random forest algorithms to classify frailty and falling history in seniors using plantar pressure measurement insoles: a large-scale feasibility study

 

Whole population models

≥ 65 years old models

65–69 years old models

70–74 years old models

≥ 75 years old models

≥ 65 women models

≥ 65 men models

[Wavelet analysis] Ratio of height of peak 2 to height of valley (average of left foot)

O

O

O

O

O

O

O

[Wavelet analysis] Ratio of height of peak 1 to height of valley (SD of left foot)

O

O

O

O

O

O

O

[Wavelet analysis] Ratio of height of peak 1 to height of valley (average of left foot)

O

O

O

O

O

O

O

[Gait phase analysis] Stance phase duration (average of left foot)

O

O

O

 

O

O

O

[Wavelet analysis] Ratio of height of peak 2 to height of valley (SD of left foot)

O

O

O

O

O

O

 

[Wavelet analysis] Slope rate from the starting point to peak 1 (average of left foot)

O

O

    

O

[Peak analysis and AUC] Maximum pressure of heel sensor (average of left foot)

O

O

   

O

 

[Peak analysis and AUC] AUC of center midfoot sensor (average of left foot)

O

O

O

O

 

O

 

[Wavelet analysis] Height of peak 2 (average of left foot)

O

    

O

O

[Peak analysis and AUC] Time when maximum pressure of heel sensor occurred (average of left foot)

O

O

  

O

  

[Gait phase analysis] Percentage of double support phase duration (average of left foot)

 

O

O

  

O

 

[1-foot COP trajectory analysis] Y coordinate of double-to-single support phase transition (average of left foot)

  

O

    

[Wavelet analysis] Height of peak 1 (SD of left foot)

  

O

    

[1-foot COP trajectory analysis] Minimal value on y axis (SD of left foot)

  

O

    

[Peak analysis and AUC] Maximum pressure of center midfoot sensor (average of left foot)

   

O

   

[Peak analysis and AUC] Maximum pressure of center midfoot sensor (SD of both feet)

   

O

   

[Peak analysis and AUC] Maximum pressure of center midfoot sensor (Difference of two feet)

   

O

   

[Peak analysis and AUC] AUC of center midfoot sensor (SD of both feet)

   

O

   

[Peak analysis and AUC] AUC of center midfoot sensor (average of left foot)

   

O

   

[1-foot COP trajectory analysis] CPEI (SD of left foot)

    

O

  

[1-foot COP trajectory analysis] X at y coordinate of center midfoot sensor (SD of left foot)

    

O

  

[Peak analysis and AUC] Maximum pressure of center forefoot sensor (SD of both feet)

    

O

  

[Peak analysis and AUC] Time when maximum pressure of center midfoot sensor occurred (average of left foot)

    

O

 

O

[Wavelet analysis] Slope rate of peak 2 to the endpoint (average of left foot)

     

O

 

[Wavelet analysis] Slope rate from valley to peak 2 (average of left foot)

      

O

[Frequency domain analysis] SD of power spectrum

      

O

[Wavelet analysis] Distance between peak 1 and peak 2 (average of left foot)

      

O

  1. For the whole population models, features are listed from top to bottom in the same order as they ranked (see the top 10 rows). Then, new important features found in the 1) subjects aged ≥65 years old, 2) subjects aged between 60 and 69 years old, 3) subjects aged between 70 and 74 years old, 4) subjects aged ≥75 years old, 5) women aged≥65 years, and 6) men aged ≥65 years analyses appear in the 17 remaining rows
Back to article page

BMC Geriatrics

ISSN: 1471-2318

Contact us