Developing Item Response Theory-Based Short Forms to Measure the Social Impact of Burn Injuries.
Molly E Marino, Emily C Dore, Pengsheng Ni and 5 others
PMID 28888383WHAT IT FOUND
Ten-item short forms of the LIBRE Profile reliably measure social participation in burn survivors.
They offer a feasible alternative to computer-adaptive testing when technology is unavailable, though they lose some precision at extreme scores.
Key findings
01Six ten-item short forms were developed from a 601-person burn survivor sample to measure social participation.
02The short forms demonstrated marginal reliability between .85 and .89, compared to .87 to .93 for the full item bank.
03Ceiling effects were limited to 15% or less across all scales, with floor effects under 1%.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
The study used a convenience sample of 601 burn survivors, who may be more engaged in social support programs than the general burn population. This engagement bias may explain some of the ceiling effects observed in the data. There is a loss of precision at extreme scores (very low or very high) compared to the full item bank. The short forms rely on a two-parameter graded response IRT model, which requires linking scores to a common metric for cross-sample comparison. There is currently no clinically meaningful guide for interpreting scores beyond the item map example provided.
Declared interests
The study was supported by the U.S. Government (Non-P.H.S.). No specific commercial conflicts or author disclosures are detailed in the provided text.
The easy way to misread this
Do not assume the short forms are identical to the full assessment in precision. They lose reliability at extreme scores and are intended as a feasible alternative when computer-adaptive testing is unavailable, not a replacement for the full item bank in all contexts.