Table 3.
Meta-analysis results of prediction of postoperative FEV1: Standard deviation.
| Prediction technique | Studies | Standard deviation | Cochran's Q test of heterogeneity (p value) |
|---|---|---|---|
| CT — volume & density | 2 (n = 75) | 207 ml | 1.569 (0.2103) |
| Subsegment counting | 2 (n = 60) | 274 ml | 0.047 (0.8279) |
| Perfusion scintigraphy | 5 (n = 109) | 285 ml | 3.690 (0.4495) |
| Segment counting | 4 (n = 145) | 331 ml | 3.361 (0.3392) |
| CT — volume & partial density | 1 (n = 23) | 229 ml | Single study |
| SPECT–CT | 1 (n = 37) | 249 ml | Single study |
| Ventilation scintigraphy | 1 (n = 23) | 303 ml | Single study |
| CT — perfusion | 1 (n = 14) | 329 ml | Single study |
This meta-analysis produces a combined standard deviation of the mean difference based on the standard deviations quoted in included studies. It should be noted this is mathematically distinct from the standard error of the mean for the reported meta-analysis mean difference. Null hypothesis for Cochran's Q test is homogeneity.