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Table 5 Exploratory Factor Analysis of the R8 Depression using baseline sample (n = 270)

From: Validation of a novel online depression symptom severity rating scale: the R8 Depression

Test results    
 Bartlett’s test Chi-Square = 2897.213   
  p < 0.001   
 Kaiser–Meyer–Olkin test 0.906   
Before rotation    
 Number of factors 6   
 Percentage of variance extracted 58.6%   
 Scree test 1   
 Direct Oblimin rotation (Delta:.0)   
First factor   Fourth factor  
 % of variance 32.7%  % of variance 5.1%
 Items Feeling worthless (0.85)  Items Appetite change (− 0.93)
  Feeling guilty (0.62)   Weight change (− 0.63)
  Feeling hopeless (0.60)   Excessive sleep (− 0.24)
  Sadness (0.59)   
  Sensitivity to criticism (0.59)   
  Suicidal thoughts (0.53)   
  Loss of enjoyment (0.39) Fifth factor  
  Crying (0.36)  % of variance 4.4%
  Socializing (0.36)  Items Difficulty concentrating (0.66)
Second factor    Indecisiveness (0.56)
 % of variance 6.7%   Forgetfulness (0.62)
 Items Staying asleep (0.67)   Feeling slow (0.55)
  Waking early (0.64)   
  Falling to sleep (0.37)   
  Feeling restless (0.25) Sixth factor  
Third factor    % of variance 4.0%
 % of variance 5.7%  Items Anxiety (− 0.65)
 Items Lack of energy (0.58)   Physical symptoms (− 0.51)
  Motivation (0.53)   Health worries (− 0.39)
  Activities (0.39)   Feeling irritable (− 0.34)