Table 4.

OQAQ component score results for Kropmans et al 1999[27]

OQAQ Question	YES	Can't Tell	No
1. Were the Search methods used to find evidence on the primary question(s) stated?			X
2. Was the search for evidence reasonably comprehensive?		X
3. Were the criteria used for deciding which studies to include in the overview reported?	X
4. Was bias in the selection of studies avoided?	X
5. Were the criteria used for assessing the validity of the included studies reported?			X
6. Was the validity of all the studies referred to in the text assessed using appropriate criteria?			X
7. Were the methods used to combine the findings of the relevant (to reach a conclusion) reported?		X
8. Were the findings of the relevant studies combined appropriately relative to the primary question of the overview?		X
9. Were the conclusions made by the author(s) supported by the data and/or analysis reported in the overview?		X