Because of this homogeneity, results in this study were collapsed across experimental groups.
For this study, provider types were collapsed by service sector into mental healthcare (types 1 and 2), general medical (type 3) and the non-health care sector (types 4 and 5).
Main Outcome Measure: One interviewer administered a structured in-person interview tool designed for this pilot study, data from which were collapsed into 4 change categories: communication and speech, feeding and nutrition, oral motor function, and gastrointestinal function.
Although many of our outcomes overlap with definitions in the World Health Organization's International Classification of Functioning, Disability and Health (ICF [14], for this study multiple ICF classifications were collapsed into a few more broadly-defined outcomes.
In the present study, the ICPC codes were collapsed into broad categories, which might improve the validity.
Frequency in 2002 was classified for most exposures as never, rarely, usually, and always (for this study the latter two were collapsed into one category); exposure to repetitive movements was classified as yes/no.
When a study examined additional factors, these were collapsed to yield 2×× 2 designs (e.g., imminency in Chu, 1966), and when a study's threat and/or efficacy manipulation had three levels, only the lowest and highest levels were used (e.g., Duval & Mulilis, 1999).
For the purpose of our study, the latter two categories were collapsed together.
Memory decisions were collapsed across the study task (pleasant/common) for both study and test models.
However, the way severity categories were collapsed differ between studies and hamper the comparability of outcomes.
