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R and I2 statistics for the smoking cessation data.
| R | I2 (%) | |
| Common-effect and consistent → random-effects and consistent | 3.11 | 90 |
| Random-effects and consistent → random-effects and inconsistent | 1.63 | 63 |
| Common-effect and consistent → random-effects and inconsistent | 5.08 | 96 |
