Richard WB, Leslie IW, William BW. Timed mobility: description of measurement, performance, and dimensionality among older adults. 2017. Disability and Rehabilitation. [Epub ahead of print].
https://doi.org/10.1080/09638288.2017.1323028
When the above article was first published online, there were errors in the data of Table 2 which have now been corrected online and in print versions.