Researchers opposing the Dodo bird verdict have found Dodo bird supporters' meta-analyses to be "agenda"-based and highly subjective. Arguments have proposed that meta-analyses could possibly produce misleading results because of the type of studies combined in the comparison. In Paul Crits-Christoph's review of Wampold et al.'s (1997) comparative study, a work that supported the Dodo bird verdict, he concluded that out of the 114 articles used in the study, 79 of them involve similar comparative tests. Some meta-analyses constructed are not sensitive to the subtle distinctions between treatment effects, especially among comparative studies of highly similar treatments.