Although the presence of biphasic events of the FECG was associated with more interventions for fetal distress and an increased risk of adverse outcome compared with cases with no biphasic events , the presence of significant ( i.e. intervention advised according to cardiotocography interpretation ) biphasic events showed no independent association with interventions for fetal distress -LSB- odds ratio ( OR ) @ , @ % confidence interval ( CI ) @-@ @ -RSB- or adverse outcome ( OR @ , @ % CI @-@ @ ) .