Table 4. Proportion meta-analysis of mortality rates in Brazilian studies by time period.
| Time period | Studies n |
I2% | Events n | Patients n | Proportion meta-analysis per 10,000 anesthetics (95% CI) | P value for subgroup |
|---|---|---|---|---|---|---|
| Pre-1990 versus 1990–2020 | ||||||
| Perioperative mortality | ||||||
| Pre-1990 | 1 | NA | 99 | 51,422 | 19.25 (15.64–23.24) | 0.1984 |
| 1990–2020 | 8 | 99.0 | 1,054 | 532,546 | 25.40 (13.01–41.86) | |
| Anesthesia-related mortality | ||||||
| Pre-1990 | 1 | NA | 9 | 51,422 | 1.75 (0.76–3.11) | 0.5404 |
| 1990–2020 | 6 | 81.0 | 20 | 287,402 | 0.67 (0.09–1.66) | |
| Entirely anesthesia-related mortality | ||||||
| Pre-1990 | - | - | - | - | - | NA |
| 1990–2020 | 5 | 49.1 | 7 | 228,849 | 0.22 (0.05–0.68) | |
Abbreviations. I2: indicates heterogeneity among studies; CI = confidence interval; NA = not available