Table 2.
Summary of evidence and GRADE assessment of certainty and quality of the evidence in this meta-analysis.
| No. trials | Risk of bias | Inconsistency | Indirectness | Imprecision | Absolute Effect |
Relative Effect |
Certainty | |
|---|---|---|---|---|---|---|---|---|
| Events / Intervention | Events / Control | OR (95% CI) | ||||||
| Postoperative atelectasis (follow up: 3 days) | 8/340 (2.3%) |
23/334 (6.9%) |
OR 0.42 (95% CI 0.18–0.95) |
⊕⊕ΟΟ | ||||
| 8 | Serious | Serious | Not serious | Not serious | Low | |||
| Postoperative hypoxemia (follow up: 3 days) | 6/177 (3.4%) |
20/171 (11.7%) |
OR 0.26 (95% CI 0.10–0.68) |
⊕⊕⊕Ο | ||||
| 3 | Not serious | Serious | Not serious | Not serious | Moderate | |||
| Postoperative pneumonia (follow up: 3 days) | 10/317 (3.2%) |
18/311 (5.8%) |
OR 0.57 (95% CI 0.25–1.26) |
⊕⊕⊕Ο | ||||
| 7 | Serious | Not serious | Not serious | Not serious | Moderate | |||
| Postoperative ARDS (follow up: 3 days) | 1/113 (0.9%) |
4/113 (3.5%) |
OR 39 (95% CI 0.07–2.08) | ⊕⊕⊕Ο | ||||
| 3 | Not serious | Serious | Not serious | Not serious | Moderate | |||
| Respiratory compliance (follow up: 30 min after OLV) |
MD 4.42 (95% CI 3.13 to 5.72) |
⊕⊕⊕Ο | ||||||
| 3 | Serious | Not serious | Not Serious | Serious | – | – | Moderate | |
| Plateau pressure (follow up: 30 min after OLV) |
MD −2.59 (95% CI −4.56 to −0.62) |
⊕⊕ΟΟ | ||||||
| 3 | Serious | Not serious | Not Serious | Serious | – | – | Low | |
| Peak inspiratory pressure (follow up: 30 min after OLV) | – | – |
MD −3.32 (95% CI −7.82 to 1.19) |
⊕⊕ΟΟ | ||||
| 2 | Serious | Not serious | Not serious | Serious | Low | |||
| Forced expiratory volume FEV1 (follow up: day 1 after surgery) | – | – |
MD 0.29 (95% CI 0.10 to 0.49) |
⊕⊕⊕Ο | ||||
| 2 | Not serious | Not serious | Not serious | Serious | Moderate | |||
| Forced expiratory volume FEV1 (follow up: day 2 after surgery) | – | – |
MD 0.27 (95% CI 0.12 to 0.41) |
⊕⊕⊕Ο | ||||
| 2 | Not serious | Serious | Not serious | Not serious | Moderate | |||
| Length of hospital stay | – | – | ⊕⊕ΟΟ | |||||
| 4 | Not serious | Serious | Serious | Not serious | MD | Low | ||
CI: Confidence interval; MD: Mean difference; OR: Odds ratio; ARDS: acute respiratory distress syndrome.