Learning curve and embolisation strategy in single-stage surgery combined embolisation and microsurgery for brain arteriovenous malformations: results from a nationwide multicentre prospective registry study.

Although the association with fewer major complications did not reach statistical significance, group 2 was still associated with a decreased risk of unfavourable outcomes at discharge (OR 0.333, 95% CI 0.130 to 0.852, p=0.022) ( table 2 ).

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The significance of the peak value was that the failure rate showed a decreasing trend starting from the 25th operation.

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