Thus, interventions with objectives of preparing for
childbirth, managing maternal stress, anxiety and depression,
and infant outcomes were excluded. When no research
reports were found from 1990 to 1995 that met
the selection criteria, the electronic search was supplemented
with intervention articles cited in key references
covering research on MRA/BAM (Mercer,1995; Walker,
1992), as well as articles known to us through other
sources. Twenty-eight studies were found that met the
criteria for selection.