MERCK RESEARCH LABORATORIES REDUCES STANDARD DEVIATION WITH ELECTRONIC PRO ePRO data deemed quantitatively superior to paper-based study arm CASE STUDY2 MERCK RESEARCH LABORATORIES REDUCES STANDARD DEVIATION WITH ELECTRONIC PRO SITUATION A formal clinical trial called the “Comparison Study” was the first parallel, controlled, randomized study to compare and quantify the differences in data quality between electronic and paper data collection methods. The primary objective of this study was to test the assumption that clinical data collected electronically would be of higher quality and more easily analyzed than those collected by paper. Many differences between electronic patient-reported outcome (ePRO) and paper methods were expected to affect data quality (See Appendix), and th

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