Table 4. Number of red cell transfusions and number of red cell units.
| Study | Intervention | Number of participants in each arm | Number of red cell transfusions/participant | Comparison statistics | P value | Number of red cell units transfused/participant | Comparison statistics | P value |
|---|---|---|---|---|---|---|---|---|
| Short-term follow-up (up to 30 days) | ||||||||
| Diedrich 2005 | < 10 × 109/L | 79 | Median 4; range 0 to 26 | Not reported | Not significant | Not reported | Not reported | Not reported |
| < 30 × 109/L | 87 | Median 4; range 0 to 31 | Not reported | Not reported | ||||
| Heckman 1997 | ≤ 10 × 109/L | 37 | Mean 12.2 ± SD 6.9* | MD 1.50, 95% CI −1.22 to 4.22* | Not reported | Not reported | Not reported | Not reported |
| ≤ 20 × 109/L | 41 | Mean 10.7 ± SD 5.1* | Not reported | Not reported | ||||
| Rebulla 1997 | < 10 × 109/L | 135 | Mean 9.57 ± SD 5.18 | MD 0.50, 95% CI −0.70 to 1.70* | Not reported | Not reported | Not reported | Not reported |
| < 20 × 109/L | 120 | Mean 9.07 ± SD 4.58 | Not reported | Not reported | ||||
*
unpublished data provided by the author. The paper provided medians and ranges median 11 (8 to 14) for the standard-trigger arm and median 10 (6 to 14) for the higher-trigger arm (P = 0.41).
CI = confidence interval
MD = mean difference
SD = standard deviation