TY - JOUR AU - Hausner, Elke AU - Metzendorf, Maria-Inti AU - Richter, Bernd AU - Lotz, Fabian AU - Waffenschmidt, Siw PY - 2018 DA - 2018/12/18 TI - Study filters for non-randomized studies of interventions consistently lacked sensitivity upon external validation JO - BMC Medical Research Methodology SP - 171 VL - 18 IS - 1 AB - Little evidence is available on searches for non-randomized studies (NRS) in bibliographic databases within the framework of systematic reviews. For instance, it is currently unclear whether, when searching for NRS, effective restriction of the search strategy to certain study types is possible. The following challenges need to be considered: 1) For non-randomized controlled trials (NRCTs): whether they can be identified by established filters for randomized controlled trials (RCTs). 2) For other NRS types (such as cohort studies): whether study filters exist for each study type and, if so, which performance measures they have. SN - 1471-2288 UR - https://doi.org/10.1186/s12874-018-0625-4 DO - 10.1186/s12874-018-0625-4 ID - Hausner2018 ER -