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Table 3 Comparison of Evaluation and Validation Subsample Characteristics

From: Use of NON-PARAMETRIC Item Response Theory to develop a shortened version of the Positive and Negative Syndrome Scale (PANSS)

  Evaluation Validation    Effect Size
Sample 3593 3594    
Continuous Mean (sd) Mean (sd) t (7185) p Cohen's d
Age 39.49 (12.21) 39.43 (12.27) 0.048 0.962 0.005
PANSS      
   Positive 19.43 (6.60) 19.57 (6.80) - 0.961 0.373 - 0.021
   Negative 22.70 (6.92) 22.71 (6.93) - 0.049 0.961 - 0.001
   General 40.82 (10.09) 40.85 (10.14) - 0.142 0.887 - 0.003
   Total Score 82.95 (19.30) 83.13 (19.60) - 0.471 0.638 - 0.009
Categorical n (Percent) n (Percent) Chi Square   
Gender      Cramer'sφ
   Male 2391 (66.55%) 2383 (66.30%) Χ 2 (1) = 1.40 0.595 0.014
   Female 1202 (33.45%) 1210 (33.67%)    
Diagnosis      
   Schizophrenia 3437 (95.66%) 3429 (95.41%) Χ 2 (1) = 1.04 0.669 0.012
   Schizoaffective 156 (4.34%) 165 (4.59%)    
Race      
   Caucasian 2407 (66.99%) 2432 (67.67%) Χ 2 (4) = 13.70 0.134 0.044
   Asian 255 (7.10%) 246 (6.84%)    
   Black 614 (17.09%) 648 (18.03%)    
   Hispanic 187 (5.20%) 177 (4.92%)    
   Other 130 (3.62%) 91 (2.53%)    
  1. Note. Level of significance, p ≤ .05 (two-tailed)