Study designs of evaluations included in the review
No inclusion criteria relating to the study design were stated. With the exception of one study, all of the studies were observational (case studies and cohort studies).
Specific interventions included in the review
Studies of any type of HRT (whether oestrogen alone or combined oestrogen-progesterone) were included.
Participants included in the review
Postmenopausal women were included.
Outcomes assessed in the review
Stroke (fatal or nonfatal, ischaemic or haemorrhagic) was the outcome of interest.
How were decisions on the relevance of primary studies made?
The authors do not state how the papers were selected for the review, or how many of the reviewers performed the selection.