Table 4.
Comparison of precision (1/SE) and classification of studies based on pilot/feasibility or sample size categories
| Precision | Percentage of trials per decile of precision | |||||||
|---|---|---|---|---|---|---|---|---|
| Decile of precision | Minimum | Maximum | N > 370 | N > 100 to 369 | N < 100 | Pilot | ES | (95CI) |
| 0 to 10% | 1.11 | 2.95 | 1% | 4% | 36% | 59% | 0.44 | (0.31, 0.56) |
| 10 to 20% | 2.96 | 3.75 | 0% | 5% | 51% | 44% | 0.58 | (0.47, 0.69) |
| 20 to 30% | 3.78 | 4.36 | 2% | 5% | 67% | 27% | 0.32 | (0.22, 0.43) |
| 30 to 40% | 4.36 | 5.32 | 4% | 36% | 40% | 20% | 0.32 | (0.21, 0.42) |
| 40 to 50% | 5.33 | 6.57 | 5% | 74% | 7% | 14% | 0.26 | (0.16, 0.36) |
| 50 to 60% | 6.58 | 8.05 | 3% | 74% | 4% | 19% | 0.20 | (0.10, 0.30) |
| 60 to 70% | 8.06 | 9.83 | 29% | 60% | 2% | 8% | 0.16 | (0.06, 0.26) |
| 70 to 80% | 9.83 | 11.57 | 77% | 14% | 1% | 9% | 0.17 | (0.08, 0.27) |
| 80 to 90% | 11.59 | 15.76 | 78% | 9% | 4% | 10% | 0.08 | (− 0.02, 0.18) |
| 90 to 100% | 15.81 | 106.50 | 88% | 3% | 3% | 6% | 0.04 | (− 0.06, 0.13) |