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Table 2 Pitch perception and motivation in depressive patients and non-depressive controls

From: Impaired pitch identification as a potential marker for depression

  Depressives N = 12 Controls N = 12 Difference t/Za p
  M ± SD M ± SD M ± SD   
Accuracy      
Pitch identification 23.7 ± 10.6 31.4 ±    6.0 −7.6 ± 12.0 −2.1 0.040*
Pitch contour percept. 27.5 ± 10.1 23.9 ± 11.4 3.5 ± 17.3 0.8 0.426
Pitch discrimination 26.6 ± 13.7 25.3 ± 11.5 1.3 ± 18.2 0.2 0.799
Reaction time (ms)      
Pitch identification 1013 ± 234 954 ± 125 58 ± 290 0.7 0.453
Pitch contour percept. 932 ± 224 930 ± 232 1 ± 341 0.1 0.987
Pitch discrimination 864 ± 230 794 ± 175 69 ± 291 0.8 0.413
Responsiveness      
Pitch identification 51.7 ± 12.9 58.0 ±   1.9 −6.2 ± 13.8 −0.2a 0.785
Pitch contour percept. 48.0 ± 16.7 40.0 ± 17.9 8.0 ± 28.1 1.1 0.266
Pitch discrimination 44.9 ± 19.1 42.6 ± 20.9 2.2 ± 32.3 0.2 0.786
Self-rated motivation 7.9 ±   1.4 8.0 ±   1.5 −0.1 ±   1.9 −0.2a 0.859
  1. Accuracy = correct responses. Responsiveness = correct plus incorrect responses. Degree of freedom = 22. a non-parametric Mann–Whitney U-test because of a ceiling effect. *p < 0.050.