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Table 2 Critical aperture, imagery and action ratios in the anorexia nervosa (AN) group and in the healthy control group

From: Painfully thin but locked inside a fatter body: abnormalities in both anticipation and execution of action in anorexia nervosa

  AN group Control group  
  (n = 14) (n = 14)  
  Mean SD Median Min; Max Mean SD Median Min; Max p
Critical aperture          
Motor imagery task 44.32 6.11 45.75 9.5 ; 58.5 46.64 4.94 42.00 6.0 ; 56.5 0.28(a)
Action task 7.35 3.24 48.00 3.0; 52.0 47.75 3.00 48.00 0.0 ; 53.0 0.74(a)
Ratio          
Motor imagery task 1.29 0.17 1.27 1.05 ; 1.62 1.09 0.10 1.09 0.90 ; 1.21 <.0001(b)
Action task 1.32 0.07 1.34 1.13 ; 1.41 1.16 0.07 1.16 1.05 ; 1.32 <.0001(b)
   First set 1.29 0.08 1.30 1.13 ; 1.38 1.16 0.11 1.13 1.02 ; 1.42  
   Second set 1.35 0.11 1.37 1.13 ; 1.51 1.18 0.06 1.17 1.06 ; 1.28  
  1. Critical aperture in the motor imagery task: the mean width at which the participant thinks it is no longer possible to pass through without turning the shoulders. Critical aperture in the action task: the mean width at which the participant begins to turn their shoulders by more than a baseline level of natural body sway. Ratio in the motor imagery task: the motor imagery critical aperture divided by the shoulder width in the motor imagery condition. Ratio in the action task: the action critical aperture divided by shoulder width in the action condition. (a): in a T test; (b): in a Mann–Whitney U test.