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Pooled estimates for polyphenols on total sleep time in subgroups of trials.
| Group | Subgroups | Number | Chi2 | P-Value | I2 (%) |
|---|---|---|---|---|---|
| All | 7 | 10.92 | 0.09 | 45% | |
| Treatment duration | ≥4 weeks | 2 | 0.00 | 0.97 | 0.0% |
| <4 weeks | 5 | 5.17 | 0.27 | 23% | |
| Sample size | ≥25 | 2 | 0.00 | 0.97 | 0.0% |
| <25 | 5 | 5.17 | 0.27 | 23% | |
| Geographic location | Asia | 3 | 1.60 | 0.45 | 0.0% |
| Others | 4 | 2.56 | 0.46 | 0.0% | |
| Study design | Parallel trial | 3 | 2.27 | 0.32 | 12% |
| Crossover trial | 4 | 4.45 | 0.22 | 33% |
