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Table 1 Results of the variance component analysis for the full scale and for item 2 to 10

From: Administering the MADRS by telephone or face-to-face: a validity study

 

Variance components

Percentages of total (%)

Estimates of the variance components

Full scale

Patients

29.8

0.824

 

Assessment Modea

5.7

0.157

 

Measurement errorb

35.2

0.973

 

Residual error

29.4

0.814

Item 2 to 10

Patients

28.7

0.808

 

Assessment Mode

5.5

0.154

 

Measurement error

38.0

1.074

 

Residual error

27.8

0.783

Combined model

Patients

34.5

0.958

 

Test length by Mode

0.8

0.02

 

Measurement + Residual error

64.8

1.80

  1. a Assessment Mode: face-to-face or telephonic
  2. b Measurement error was assessed by the Patient * Item terms