Table 5.
Internal consistency measures overall Cronbach’s α, ‘Cronbach’s α if item deleted’ and inter-item correlations for all FDI-NL items on the test measurement moments
| Cronbach’s α | Inter-item correlation | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | If item deleted | Item 1 | Item 2 | Item 3 | Item 4 | Item 5 | Item 6 | Item 7 | Item 8 | Item 9 | Item 10 | |
| Physical function | 0.720 | |||||||||||
| Item 1 | 0.644 | 1.000 | 0.501 | 0.327 | 0.275 | 0.419 | 0.166 | 0.061 | 0.238 | 0.199 | 0.166 | |
| Item 2 | 0.638 | – | 1.000 | 0.409 | 0.180 | 0.471 | 0.095 | 0.060 | 0.207 | 0.273 | 0.184 | |
| Item 3 | 0.685 | – | – | 1.000 | 0.209 | 0.337 | 0.121 | 0.169 | 0.086 | 0.107 | 0.205 | |
| Item 4 | 0.736 | – | – | – | 1.000 | 0.272 | 0.241 | 0.061 | 0.059 | 0.316 | 0.153 | |
| Item 5 | 0.651 | – | – | – | – | 1.000 | 0.209 | 0.082 | 0.112 | 0.255 | 0.363 | |
| Social/well-being function | 0.607 | |||||||||||
| Item 6 | 0.481 | – | – | – | – | – | 1.000 | 0.553 | 0.175 | 0.182 | 0.474 | |
| Item 7 | 0.464 | – | – | – | – | – | – | 1.000 | 0.232 | 0.196 | 0.489 | |
| Item 8 | 0.619 | – | – | – | – | – | – | – | 1.000 | 0.057 | 0.128 | |
| Item 9 | 0.686 | – | – | – | – | – | – | – | – | 1.000 | 0.174 | |
| Item 10 | 0.502 | – | – | – | – | – | – | – | – | – | 1.000 | |