Table 5.
Fit statistics during removal of misfit items from J-EAT-10 with scoring structure 01122
| Scale analysis | % Extr. | Fit residuals mean (SD) | Item-trait interaction | Reliability | Individual item-fit | |||
|---|---|---|---|---|---|---|---|---|
| Item | Person | χ2 (df) | P | PSI / α | Power of fit | Misfit items | ||
| 4.a. Remove item 6 | 42% | −1.58 (3.96) | −0.36 (0.95) | 382.42 (36) | < 0.001 | 0.61 / 0.79 | Reasonable |
Item 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 10 | 42% | −1.28 (3.53) | − 0.34 (0.93) | 299.55 (24) | < 0.001 | 0.53 / 0.74 | Reasonable |
Item 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 4 | 43% | −1.02 (2.85) | −0.33 (0.87) | 230.68 (21) | < 0.001 | 0.40 / 0.66 | Low |
Item 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 3 | 43% | −0.69 (2.15) | − 0.32 (0.85) | 196.29 (18) | < 0.001 | 0.24 / 0.55 | Too low |
Item 7 / FR = − 2.8 a,b Item 8 / FR = − 2.6 a,b Item 1,2,5 a,b |
| 4.e. Remove item 7 | 45% | −0.39 (1.63) | − 0.28 (0.75) | 163.76 (10) | < 0.001 | 0.02 / 0.38 | Too low | Item 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 | |||
In analyses 4.c. to 4.e, item 9 displayed satisfactory fit
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
aSignificant χ2 (Bonferroni adjusted)
bSignificant F statistics (Bonferroni adjusted)