Table 2.
Results of reliability, test-retest of the Spanish Bristol Foot Score (BFS-S) questionnaire according to each question.
| TEST (n=53) Mean ± SD (CI 95%) | RETEST (n=53) Mean ± SD (CI 95%) | ICC (CI 95%) | P- value | SEM | %CV | SEM% | LoA Mean diference (limits) | MDC | P-value Breusch-Pagan | |
|---|---|---|---|---|---|---|---|---|---|---|
| Question 1. Do problems with your feet affect whether you go out of the house to visit family or friends? | 1.60±0.92 (1.34-1.85) |
1.56±0.86 (1.32-1.80) |
0.963 (0.936-0.79) | 0.419 | 0.005 | 1.684 | 0.321 | 0.038 (-0.324-0.999) |
0.014 | 0.103 |
| Question 2. Do problems with your feet affect whether you walk to the shops? | 1.62±0.90 (1.37-1.87) | 1.67±0.91 (1.42-11.93) |
0.959 (0.928-0.976) |
0.261 | 0.008 | 2.424 | 0.494 | -0.057 (-0.348-1.073) |
0.023 | 0.239 |
| Question 3. Do problems with your feet affect you when standing still? | 1.67±0.97 (1.41-1.94) |
1.73 ±.092 (1.48-1.99) | 0.962 (0.935-0.978) | 0.261 | 0.008 | 2.344 | 0.457 | -0.057 (-0.348-1.073) |
0.022 | 0.001 |
| Question 4. Do problems with your feet affect you when walking on bumpy or stony ground? | 2.18±1.05 (1.98-2.48) |
2.15 ±.1.02 (1.86-2.43) |
0.944 (0.903-0.968) |
0.569 | 0.006 | 1.230 | 0.289 | 0.038 (-0.460-1.417) |
0.017 | 0.007 |
| Question 5. Over the last two weeks how painful have your feet been? | 2.16±1.29 (1.81-2.52) |
2.13±1.27 (1.78-2.48) |
0.897 (0.822-0.941) |
0.727 | 0.024 | 2.417 | 1.107 | -0.075 (-1.095-3.377) |
0.068 | 0.002 |
| Question 6. Over the last two weeks, how often have you felt this way about your feet? "I have felt conscious of my feet". |
2.81±1.75 (2.32-3.29) |
2.64±1.71 (2.16-3.11) |
0.918 (0.857-0.953) | 0.201 | 0.026 | 3.402 | 0.949 | 0.132 (-0.884-2.725) |
0.072 | 0.091 |
| Question 7. Over the last two weeks, how often have you felt this way about your feet? "I have felt fed up about my feet". |
2.45±1.68 (1.98-2.91) |
2.35±1.69 (1.89-2.82) |
0.950 (0.913-0.971) |
0.358 | 0.015 | 2.773 | 0.622 | 0.094 (-0.711-2.192) |
0.041 | 0.010 |
| Question 8. Over the last two weeks, how often have you felt this way about your feet? "I have felt worried that my feet will get worse in the future". |
2.54±1.61 (1.79-2.69) |
2.13±1.56 (1.69-2.56) |
0.933 (0.883-0.961) |
0.308 | 0.021 | 3.657 | 0.950 | 0.113 (-0.768-2.369) |
0.058 | 0.926 |
| Question 9. Over the last two weeks, have you felt this way about your feet? "I have felt my feet are not really part of me". |
1.37±0.62 (1.20-1.55) |
1.30±0.57 (1.14-1.46) |
0.886 (0.803-0.934) |
0.159 | 0.018 | 3.984 | 1.356 | 0.075 (-0.369-1.139) | 0.050 | 0.163 |
| Question 10. Because of your feet have you had problems sleeping, in the last two weeks? | 1.24±0.75 (1.03-1.45) |
1.28±0.76 (1.07-1.49) |
0.984 (0.972-0.991) |
0.159 | 0.003 | 2.111 | 0.271 | -0.038 (-0.185-0.569) |
0.009 | 0.055 |
| Question 11. In the last two weeks have you been able to put your everyday shoes on easily. |
1.60±0.83 (1.37-1.83) |
1.79±1.02 (1.50-2.07) |
0.701 (0.481-0.827) |
0.133 | 0.074 | 7.857 | 4.336 | -0.189 (-0.864-2.664) |
0.204 | 0.001 |
| Question 12. Over the last two weeks how often have you been able to wear any shoes you liked. |
1.94±1.44 (1.15-2.34) |
2.15±1.59 (1.71-2.59) |
0.888 (0.806-0.935) |
0.125 | 0.050 | 7.169 | 2.429 | -0.208 (-0.929-2.865) |
0.138 | 0.001 |
| Question 13. If you could afford any shoes you wanted, how easily could you find new shoes that fit comfortably? |
2.16±0.87 (1.92-2.40) |
2.11±0.84 (1.87-2.34) |
0.860 (0.758-0.919) |
0.497 | 0.015 | 1.869 | 0.696 | 0.057 (-0.578-1.781) |
0.041 | 0.072 |
| Question 14. In general, would you say your foot health is: | 2.64±1.19 (2.37-2.97) |
2.58±1.18 (2.25-2.91) |
0.939 (0.895-0.965) |
0.472 | 0.010 | 1.532 | 0.376 | 0.057 (-0.546-1.684) |
0.027 | 0.917 |
| Question 15. Would you say your general health is: | 2.62±0.94 (2.36-2.88) |
2.64±0.85 (2.40-2.87) |
0.957 (0.925-0.975) |
0.709 | 0.003 | 0.507 | 0.104 | -0.019 (-0.352-1.085) |
0.008 | 0.635 |
Abbreviations: SD, Standard Desviation; CI 95%, confidence interval 95%; ICC, Intraclas Correlation Index. P value from Wilcoxon Signed-Rank Test; SEM, standard error of measurement; %CV, coefficient of variation; SEM%, percent error of the SEM; LoA, 95% limits of agreement statistics; MDC = minimum detectable change; P value from Breusch-Pagan test for heteroskedasticity