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. Author manuscript; available in PMC: 2018 Oct 31.
Published in final edited form as: J Clin Transl Sci. 2018 Jul 6;2(1):31–37. doi: 10.1017/cts.2018.18

Table 5.

Characteristic of the samples responding to un-compensated (RPPS-S) and compensated (RPPS-SC1, RPPS-SC2) surveys, were compared based on response frequencies to two previously validated questions about prior study participation/.

Survey
question		 Did you have to be
affected by a disease or
disorder in order to
participate in the study		 How demanding was participation in
the study?*
Survey Yes No Simple Moderate Intense
RPPS-S 0.423 0.576 0.483 0.449 0.067
RPPS-SC1 0.366 0.637 0.435 0.495 0.069
RPPS-SC2 0.326 0.673 0.495 0.445 0.059
*

Descriptions are provided for the levels of study intensity within the response options for the questions survey. Full surveys are provided in Supplemental Appendix S1.