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Table 2 Descriptive statistics, item-total correlations, ICC’s

From: The brief negative symptom scale: validation of the German translation and convergent validity with self-rated anhedonia and observer-rated apathy

  M SD Skew Kurtosis Item-total score r ICCb
Anhedonia
 1. Intensity of pleasure during activities 2.3 1.6 0.1 -0.9 0.80**  
 2. Frequency of pleasurable activities 2.5 1.6 0.0 -0.8 0.78**  
 3. Intensity of future pleasure 2.1 1.5 0.4 -0.3 0.69** 0.88
 Subscale total 7.1 4.4 0.1 -0.6   
Distress subscale
 4. Lack of normal distress 1.0 1.4 1.3a 0.7 0.51** 0.93
Asociality subscale
 5. Asociality behavior 2.6 1.4 0.1 -0.3 0.70**  
 6. Asociality inner-experience 2.0 1.4 0.6 -0.3 0.71**  
 Subscale total 4.6 2.6 0.4 -0.3   0.95
Avolition subscale
 7. Avolition behavior 2.5 1.3 0.0 -0.6 0.74**  
 8. Avolition inner-experience 2.1 1.5 0.2 -0.7 0.79**  
 Subscale total 4.7 2.7 0.2 -0.5   0.87
Blunted affect subscale
 9. Facial expression 2.2 1.6 0.6 -0.4 0.85**  
 10. Vocal expression 2.0 1.7 0.6 -0.5 0.81**  
 11. Expressive gestures 2.1 1.7 0.4 -1.0 0.78**  
 Subscale total 6.3 4.7 0.6 -0.5   0.95
Alogia subscale
 12. Quantity of speech 1.3 1.5 1.1a 0.9 0.72**  
 13. Spontaneous elaboration 1.5 1.7 0.9 0.0 0.75**  
 Subscale total 2.7 3.1 1.0 0.1   0.97
 BNSS total score 26.3 14.7 0.7 0.1   0.97
  1. aSkew towards nonpathological ratings
  2. bn = 28, Two-way mixed model, absolute agreement definition, average measures
  3. **p < 0.01