Table 4 Rasch analyses of dimensionality and differential item functioning (DIF) for a selected set of ADL and IADL items (HSM survey). The best selection in terms of fit and DIF is presented
HSM Survey | Fit with the one-dimensional Rasch model | Differential Item Functioning | |||
Overall fit p-value = 0.03, Person separation index = 0.88 | location | Chi square | P-value | Uniform DIF | Non-Uniform DIF |
Feeding | 3.79 | 0.49 | 0.99 | – | – |
Toileting | 2.42 | 4.21 | 0.52 | – | – |
Dressing | -0.26 | 5.65 | 0.34 | – | – |
Bathing | -0.49 | 9.43 | 0.09 | – | – |
Transferring from bed or chair | 0.63 | 1.86 | 0.87 | – | – |
Walking | -2.79 | 15.87 | 0.01 | – | – |
Shopping | -2.31 | 12.78 | 0.03 | gender | – |
Preparing meals | -0.43 | 7.64 | 0.18 | – | – |
Doing light housework | -1.92 | 8.43 | 0.13 | – | – |
Using telephone | 1.36 | 5.83 | 0.32 | – | – |
ESPS 2012 Survey | Fit with the one-dimensional Rasch model | Differential Item Functioning | |||
Overall fit p-value = 0.03, Person separation index = 0.87 | location | Chi square | P-value | Uniform DIF | Non-Uniform DIF |
Feeding | 1.90 | 1.98 | 0.85 | – | – |
Toileting | 1.67 | 6.62 | 0.25 | – | – |
Dressing | 0.01 | 7.35 | 0.20 | – | – |
Bathing | 0.30 | 12.85 | 0.02 | – | – |
Transferring from bed or chair | -0.16 | 4.24 | 0.52 | – | – |
Walking | -1.49 | 4.58 | 0.47 | gender | – |
Shopping | -1.25 | 12.40 | 0.03 | gender | – |
Preparing meals | -0.79 | 3.10 | 0.69 | gender | – |
Doing light housework | -1.19 | 11.43 | 0.04 | – | – |
Using telephone | 1.00 | 5.55 | 0.35 | – | – |
Rasch analyses of dimensionality and differential item functioning (DIF) for a selected set of ADL and IADL items. The best selection in terms of fit and DIF is presented | |||||
ESPS 2014 Survey | Fit with the one-dimensional Rasch model | Differential Item Functioning | |||
Overall fit p-value = 0.02, Person separation index = 0.88 | location | Chi square | P-value | Uniform DIF | Non-Uniform DIF |
Feeding | 2.26 | 1.10 | 0.95 | – | – |
Toileting | 2.01 | 8.26 | 0.14 | – | – |
Dressing | -0.05 | 8.97 | 0.11 | – | – |
Bathing | -0.13 | 13.53 | 0.02 | – | – |
Transferring from bed or chair | 0.05 | 3.61 | 0.61 | – | – |
Walking | -2.09 | 1.95 | 0.86 | – | – |
Preparing meals | -0.90 | 3.95 | 0.56 | gender | – |
Doing light housework | -1.83 | 11.48 | 0.04 | – | – |
Using telephone | 0.69 | 13.90 | 0.02 | – | – |