Table 2. Outcomes assessed by the EWS effectiveness studies (n = 6).

	Outcome measures
Publication	Morbidity	ICU admission	Maternal Death	Vital sign recording	Time lag*	Preop stabilization**	Referral rate#
Austin DM et al., 2013	✓
Maguire PJ et al., 2015				✓	✓
Maguire PJ et al., 2016		✓
Shields E L et al. 2016	✓	✓
Sheikh S et al., 2017		✓	✓				✓
Merriel A et al., 2017						✓

*Time lag: time interval between trigger and review.

**Preop stabilization: clinical actions taken to optimize patients undergoing a caesarean section.

^# Referral rate: rate of referral of sick patients to a higher level of care, including critical/intensive care