Skip to main content

Table 3 Results of Discriminant function analysis (forward stepwise method) with diagnostic groups as the grouping variables.

From: Thyroid function in clinical subtypes of major depression: an exploratory study

Rows: Observed classifications
Columns: Predicted classifications
   Undifferentiated Atypicals Melancholics Normal controls
  % Correct p = 0.088 p = 0.111 p = 0.133 p = 0.666
Undifferentiated 62.50 5 1 1 1
Atypicals 60.00 0 6 1 3
Melancholics 58.33 0 0 7 5
Normal controls 98.33 0 0 1 59
Total 85.56 5 7 10 68
Classification Functions (coefficients)
  Undifferentiated Atypicals Melancholics Normal controls  
  p = 0.088 p = 0.111 p = 0.133 p = 0.666  
TBII 1.04 0.57 0.49 0.14  
TSH 6.78 4.03 4.47 3.87  
TMA 0.01 0.01 0.00 0.00  
TA 0.17 0.10 0.25 0.12  
FT4 2.39 2.85 2.02 2.73  
T4/T3 ratio 2.36 0.45 4.00 2.46  
Constant -39.08 -31.56 -29.45 -29.58  
  1. The analysis succeeded in a 85.56% correct classification of all cases on the basis of thyroid indices. Only one control was falsely classified. Each case is predicted to belong to the group in whose function obtains the highest value. The chance of success of this prediction depends on the group. The four groups seems to lie on a continuum with melancholics closer to controls and undifferentiated being the group more distant to controls, and atypicals in the middle.