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| Population | Number of Studies (Number of hearts) | S-shaped branches (95% CI) | I2(95% CI) | Cochran's Q, P-value |
|---|---|---|---|---|
| All | 8(5031) | 7.6(2.9–14.1) | 97.24 (95.99–98.09) | 0.000 |
| Asia | 2 (3640) | 1.3 (0.5–2.5) | 71.94 (0–93.69) | 0.059 |
| Europe | 3 (951) | 10.4 (3.9–19.3) | 93.15 (83.33–97.18) | 0.000 |
| North America | 2 (352) | 9.5 (3.1–18.7) | 80.21 (15.05–95.39) | 0.025 |
| Imaging | 6 (4643) | 6.4 (1.5–13.8) | 97.64 (96.42–98.45) | 0.000 |
