Analysis of impact of supplementary search methods on meta-analysis conclusions

Hayden et al.'s review included unadjusted and adjusted meta-analyses (MAs) of the effect of recovery expectations on four outcomes: work participation, important recovery outcomes, functional limitations, and pain intensity. To gauge the impact of supplementary search methods on the MAs' conclusions, we repeated them with only those studies retrieved by the focused electronic search strategy. We then ran a similar experiment to see if the hypothetical broader search would have made any difference to the MAs' conclusions.