Primary study · included by 2 reviews

Zhang 2021

ProbableThe reviews cited this study without a PMID, DOI or NCT, so it is matched by first author and year. Two different studies by the same author in the same year could be merged here.

Included by

Collagen Supplementation for Skin and Musculoskeletal Health: An Umbrella Review of Meta-Analyses on Elasticity, Hydration, and Structural Outcomes.

Non-Cochrane · intervention · 2026 · cited as Zhang 2021 · Appendix A (included systematic reviews)

The review does not say which of its outcomes this study informs.

Incidence and risk factors for postoperative vascular crisis in patients with oral and maxillofacial cancer: a systematic review and meta-analysis.

Non-Cochrane · prognostic · 2026 · cited as Zhang 2021 · Table 1; Fig. 2 (incidence forest plot)

Outcome this study informs	Pooled effect	Evidence	Certainty
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 16.11 [10.31, 21.91]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 14.41 [10.23, 18.59]	27 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 19.6 [15.1, 24.0]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 10.66 [5.31, 16.01]	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 7.25 [2.31, 12.19]	3 studies	GRADE not reported
Incidence of postoperative vascular crisis Not applicable (pooled incidence) vs Not applicable · Postoperative (diagnostic windows varied: 72 h, 3 days or 7 days)	Pooled incidence (proportion) 0.14	NR	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 15.31 [10.53, 20.09]	24 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 5.23 [1.75, 8.71]	4 studies	GRADE not reported
Postoperative vascular crisis None (pooled incidence of postoperative vascular crisis) vs Not applicable	Pooled incidence (%) 16.08 [11.06, 21.11]	23 studies	GRADE not reported

2 including reviews in total.