5. Conclusion
This study demonstrated how a generic model-based approach could be applied in the development of a short version of the TOFHLA, thereby reducing the 67 items in the full-length version to 20 items. Furthermore, this study showed that the inclusion of numeracy items was not necessary to meet the chosen quality goal of a Pearson’s correlation coefficient ≥0.9, resulting in a short version of TOFHLA where the use does not require a trained interviewer. The work was based on Danish data and a validated Danish full-length version of TOFHLA. The generic model-based approach used herein may also be used in the development of short versions of the TOFHLA in other languages and in the development of short versions of any scaling questionnaire.