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Table 4 Results of Discriminant function analysis (forward stepwise method) with outcome as the grouping variables.

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

Rows: Observed classifications

Columns: Predicted classifications

  

Responders

Partial responders

 

% Correct

p = 0.633

p = 0.366

Responders

89.47

17

2

Partial responders

63.64

4

7

Total

80.00

21

9

Classification Functions

 

Responders

Partial responders

(Responders)-(Partial Responders)

 

p = 0.633

p = 0.366

 

FT4

13.27

14.78

-1.52

TSH

12.21

13.19

-0.98

FT3

0.80

0.06

0.74

TBII

0.37

0.45

-0.07

Constant

-106.96

-127.83

20.86

  1. The analysis succeeded in a 80.00% correct classification of depressed patients on the basis of thyroid indices. If we subtract the two functions, then we obtain the following function: 20.86-1.52*(FT4)-0.98*(TSH)+0.74*(FT3)-0.07*(TBII). When this function takes values above zero, then the respected depressed patient is predicted to be a responder with a 89.47% chance of success.