All behavior at less than 5 ppm
Studies at high overall risk of bias excluded.
Data not shown for Morris Water Maze data on acquisition day 1. With the
exception of the Gao et al. 2009 study, acquisition day 1 responses were not
altered. In Gao et al., 2009 escape time was significantly longer on
acquisition day 1, but not day 5. Some data from Liu et al.
2009
is also presented in Liu et al. 2011. Specifically
the values for escape time, acquisition, day 6 are identical although the animal numbers per group differ. Duplicate results are
summarized as
part of Liu et al. 2009.