Safety of intraoperative hypothermia for patients: meta-analyses of randomized controlled trials and observational studies

Table 3 Quality assessment of observational studies

Items	Yamada 2019	Williams 2018	Henriksen 2016	Frisch 2016	Williams2018	Frisch 2017	Tsuchida 2015	Billeter 2014	Jeyadoss 2013	Kebria 2012
Title and Abstract	√	√	√	√	√	√	√	√	√	√
Background/rationale	√	√	√	√	√	√	√	√	√	√
Objectives	√	√	√	√	√	√	√	√	√	×
Study design	√	√	√	√	√	√	√	√	√	√
Setting	√	√	√	√	×	√	√	×	√	√
Participants	√	×	√	√	√	√	√	√	√	√
Variables	×	×	×	×	×	×	×	×	×	×
Data sources / measurement	√	×	√	√	×	√	√	√	√	√
Bias	√	×	×	×	×	×	×	×	×	×
Study size	×	×	×	×	×	×	×	×	×	×
Quantitative variables	√	√	√	√	√	√	√	√	√	√
Statistical methods	×	×	×	×	×	×	×	×	×	×
Participants	√	×	√	√	√	√	√	×	√	√
Descriptive data	√	×	√	√	×	×	×	×	×	×
Outcome data	√	√	√	√	√	√	√	√	√	√
Main results	√	×	√	×	×	√	×	×	×	×
Other analyses	√	√	×	×	×	√	√	√	√	×
Key results	√	√	√	√	√	√	√	√	√	√
Limitations	√	√	√	√	√	√	√	√	√	×
Interpretation	√	√	√	√	√	√	√	√	√	√
Generalisability	√	√	√	√	√	√	×	√	√	√
Funding	√	×	√	×	×	×	√	×	×	×
Percentage	86·36%	54·55%	77·27%	68·18%	54·55%	72·72%	68·18%	59·09%	68·18%	54·54%
Median	68·18%

ISSN: 1471-2253