Statistical analysis
Data entry, processing and statistical analysis were carried out using
Review Manager 5.3
(RevMan 2014)10. A meta-analysis was performed to
calculate direct estimates of each treatment technique. Interventions
for patients, who achieved favourable outcomes, were pooled to evaluate
efficacy that was measured by standardized mean difference (SMD) with
95% confidence interval (CI) for operative time and postoperative ABG
improvement; and odds ratio (OR) with 95% CI for graft uptake rate. In
addition, interventions for patients, who required additional maneuvers
or reached serious adverse events, were pooled to evaluate safety that
was measured by OR with 95% CI for additional maneuvers rate and
complications rate.
According to the heterogeneity of treatment effect across trials using
the Chi2 test results
and I2-statistics; a fixed-effect model (P ≥ 0.1) or
random-effects model (P < 0.1) was used. Also, we used a
random-effects model for subgroup analysis.