auxiliary label
... that a 2006 survey found that only 7.6 percent of participants were able to understand an auxiliary label with complex instructions?
... that a 2006 survey found that only 7.6<span id="mwBIg" typeof="mw:Entity"> </span>percent of participants were able to understand an <b id="mwBIk"><a href="./Auxiliary_label" id="mwBIo" rel="mw:WikiLink" title="Auxiliary label">auxiliary label</a></b> with complex instructions?