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Table 5 Fit statistics during removal of misfit items from J-EAT-10 with scoring structure 01122

From: Item analysis of the Eating Assessment Tool (EAT-10) by the Rasch model: a secondary analysis of cross-sectional survey data obtained among community-dwelling elders

Scale analysis% Extr.Fit residuals mean (SD)Item-trait interactionReliabilityIndividual item-fit
ItemPersonχ2 (df)PPSI / αPower of fitMisfit items
4.a. Remove item 642%−1.58 (3.96)−0.36 (0.95)382.42 (36)< 0.0010.61 / 0.79ReasonableItem 1 / FR = 5.5a,b
Item 3 / FR = −4.3a,b
Item 4 / FR = −6.2a,b
Item 8 / FR = − 3.2a,b
Item 10 / FR = −6.4a,b
Item 2,5,7,9 a,b
4.b. Remove item 1042%−1.28 (3.53)− 0.34 (0.93)299.55 (24)< 0.0010.53 / 0.74ReasonableItem 1 / FR = 4.6a,b
Item 3 / FR = − 4.5a,b
Item 4 / FR = − 6.2a,b
Item 8 / FR = − 3.1a,b
Item 2,5,7,9a,b
4.c. Remove item 443%−1.02 (2.85)−0.33 (0.87)230.68 (21)< 0.0010.40 / 0.66LowItem 1/ FR = 3.5a,b
Item 3 / FR = − 4.9a,b
Item 8 / FR = − 2.6a,b
Item 2,5,7 a,b
4.d. Remove item 343%−0.69 (2.15)− 0.32 (0.85)196.29 (18)< 0.0010.24 / 0.55Too lowItem 7 / FR = − 2.8 a,b
Item 8 / FR = − 2.6 a,b
Item 1,2,5 a,b
4.e. Remove item 745%−0.39 (1.63)− 0.28 (0.75)163.76 (10)< 0.0010.02 / 0.38Too lowItem 1,2,5,8 a,b
Optimal values <  15%0 (<  1.00)0 (<  1.00) > 0.05> 0.70 FR < ±2.5, or non-significant fit statistics
  1. In analyses 4.c. to 4.e, item 9 displayed satisfactory fit
  2. J-EAT-10 Japanese version of the Eating Assessment Tool, % Extr. percentage of extreme scores, SD standard deviation, χ2 Chi-square, df degrees of freedom, PSI Person Separation Index, α Cronbach’s alpha, CI confidence interval
  3. aSignificant χ2 (Bonferroni adjusted)
  4. bSignificant F statistics (Bonferroni adjusted)