Table 3 Subgroup analysis and heterogeneity source
Subgroups | Samples | AUROC (95% CI) | Sensitivity (95% CI) | Specificity (95% CI) | DOR (95% CI) | I2 (%) (95% CI) | Q | P value | Spearman correlation coefficient | Statistical heterogeneity | Heterogeneity source |
|---|---|---|---|---|---|---|---|---|---|---|---|
Patients in ICU group | 7 | 0.95 (0.93, 0.97) | 0.91 (0.77, 0.97) | 0.88 (0.69, 0.96) | 72 (13, 396) | 77 (74, 100) | 8.53 |  < 0.01 | 0.22 | Significant | Others |
Supine or semi-recumbent | 6 | 0.95 (0.92, 0.96) | 0.88 (0.73, 0.95) | 0.89 (0.79, 0.95) | 62 (13, 297) | 0 (0, 100) | 0.42 | 0.41 | 1 | Very low | Totally threshold effect |
Low lung compliance < 30 cm H2O | 4 | 0.96 (0.94, 0.97) | 0.89 (0.72, 0.96) | 0.91 (0.81, 0.96) | 87 (15, 506) | 0 (0, 100) | 0.51 | 0.39 | 1 | Very low | Totally threshold effect |
PEEP ≥ 5 cm H2O and ≤ 15 cm H2O group | 9 | 0.95 (0.93—0.97) | 0.92 (0.82, 0.97) | 0.86 (0.73, 0.94) | 72 (19, 270) | 77 (51, 100) | 8.87 |  < 0.01 | 0.19 | Significant | Others |
Measure tools except TPTD | 5 | 0.94 (0.92, 0.96) | 0.91 (0.78, 0.97) | 0.87 (0.78, 0.93) | 70 (16, 308) | 0 (0, 100) | 0.86 | 0.33 | 1 | Very low | Totally threshold effect |
Overall data except Yonis 2017 | 9 | 0.94 (0.92, 0.96) | 0.92 (0.82,0.96) | 0.88 (0.82,0 .92) | 83 (26, 260) | 42 (0, 100) | 3.5 | 0.09 | 1 | Low | Totally threshold effect |
Overall date | 10 | 0.96 (0.94, 0.97) | 0.92 (0.83, 0.96) | 0.88 (0.76, 0.94) | 81 (23, 284) | 76 (47, 100) | 8.3, |  < 0.01 | 0.06 | Significant | Others |