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Table 2 Measurement characteristics of the three models

From: Quantifying cognition at the bedside: a novel approach combining cognitive symptoms and signs in HIV

Model Items remaining/tested Fit χ2 (p) Item location (logits) Person location (logits) Internal reliabilitya (PSI)
    Mean (SD) Mean (SD)  
MoCA alone 23/28 47.946df (0.39) 0.0 (1.3) 2.3 (0.9) 0.40
MoCA + computerized items 23/23 + 9/14 69.860df (0.18) 0.0 (1.5) 1.9 (1.1) 0.69
MoCA + computerized items+ PDQ items 21/23 + 8/9 + 9/20 96.376df (0.06) 0.0 (1.4) 1.9 (0.7) 0.73
  1. aInternal reliability or Person Separation Index (PSI) is interpreted as a Cronbach’s alpha