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. 2018 Aug 31;5:204. doi: 10.3389/fvets.2018.00204

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Copyright © 2018 Portier and Ida.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plot showing the increased risk of developing complications associated with anesthesia in patients with ASA PS ≥III compared with ASA PS <III. Q, Cochran's Q (P < 0.05 = heterogeneity; P > 0.05 = homogeneity); I², proportion of the inconsistency between the findings of the studies; df , degrees of freedom.