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Table 2 Summary of EDI scale fit to the Rasch model

From: The Early Development Instrument: an evaluation of its five domains using Rasch analysis

Scale Item residual Mean (SD) Person residual Mean (SD) Chi square Value p PSI with extremes PSI without extremes
Physical health and well-being −1.28 (5.51) −0.39 (1.00) 813.82 <0.001 0.62 0.65
Social competence −1.46 (3.53) −0.43 (1.46) 658.53 <0.001 0.87 0.90
Emotional maturity −0.87 (4.19) −0.43 (1.33) 1678.47 <0.001 0.88 0.88
Language and cognitive development −1.86 (1.76) −0.41 (0.57) 382.94 <0.001 0.72 0.78
Communication skills and general knowledge −1.78 (5.57) −0.47 (1.31) 372.98 <0.001 0.83 0.85