WSO - June 2023 - 571

Lin et al.
571
Figure 1. Flowchart for selection of cases in study.
ICH: intracerebral hemorrhage; GCS: Glasgow Coma Scale.
addition, long-term outcomes were assessed according to the
GOS score at 6 months after operation and stratified into
favorable (GOS = 4-5) versus unfavorable (GOS = 1-3). The
subinvestigators conducted the outcome evaluation and were
blinded for the type of surgery performed.
Primary and secondary outcomes
Primary outcome was the proportion of patients with
favorable outcome at 6 months (defined as GOS = 4-5).
Secondary outcomes included 30-day mortality, operation
time, ICU stay, hospital stay, intraoperative blood loss,
postoperative hematoma, postoperative rebleeding, the rate
of hematoma evacuation, and postoperative complications
(infectious meningitis, pulmonary infection, epilepsy, and
postoperative cerebral infarction).
Statistical analysis
We analyzed the categorical data using Pearson Chi-square
test or Fisher's exact test. Normally distributed measurement
data were presented as mean ± standard deviations
and were analyzed by independent-sample t test. For data
without normal distribution, median and interquartile range
(IQR) were shown and analyzed by the Mann-Whitney U
test. Propensity score matching (PSM; 1:2 match, caliper
International Journal of Stroke, 18(5)

WSO - June 2023

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