A double-blind study or experiment compares two groups of people, one of which is being tested while the other is not. Neither the people doing the testing nor the members of the two groups know which group is being tested. adj
In a double-blind trial, there were definite improvements.
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"