Does it mean "Key phrases that appear with the highest percentage (of inaccurate information)
in Web sites (containing inaccurate information)"?
Context:
One inaccuracy encountered, for example, was the high number of sites that promoted parent-child bed sharing to help encourage breast-feeding, a highly controversial topic according to researchers, as some data suggests bed sharing may increase the infant’s risk for SIDS.
Key phrases with the highest percentage of Web sites containing inaccurate information included:
Pacifier infant (14 percent accuracy)
Infant home monitors (18 percent accuracy)
Infant co-sleeping (20 percent accuracy)
More:
http://www.healthcareitnews.com/news/google-glance-may-lead-one-astray-infant-sleep-advice