|  |  | Method for missing mean replacement | |||||||
---|---|---|---|---|---|---|---|---|---|---|
 | Complete data result | Hozo [6] | Bland [21] | Wan [22] | None, omit study | |||||
 | Mean difference (days) | 95% confidence interval | Bias | Imprecision | Bias | Imprecision | Bias | Imprecision | Bias | Imprecision |
Scenario | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
5 trials | −0.01 | (−0.87, 0.85) |  |  |  |  |  |  |  |  |
2 missing means |  | −0.20 | 1.00 | −0.12 | 1.00 | 0.05 | 1.00 | 0.27 | 1.28 | |
10 trials | −0.01 | (− 0.37, 0.35) |  |  |  |  |  |  |  |  |
2 missing means |  | 0.64 | 3.47 | 0.15 | 2.15 | −0.03 | 1.00 | 0.02 | 1.06 | |
5 missing means |  | 0.12 | 4.35 | −0.06 | 1.58 | 0.04 | 1.00 | 0.00 | 1.64 | |
20 trials | 0.00 | (−0.31, 0.30) |  |  |  |  |  |  |  |  |
5 missing means |  | 1.16 | 3.67 | 0.38 | 2.30 | −0.03 | 1.00 | 0.02 | 1.25 | |
10 missing means | Â | 1.02 | 4.34 | 0.34 | 2.66 | 0.01 | 1.00 | 0.05 | 1.41 | |
30 trials | −0.01 | (−0.28, 0.25) |  |  |  |  |  |  |  |  |
5 missing means | Â | 0.02 | 1.43 | 0.01 | 1.15 | 0.01 | 1.00 | 0.09 | 1.15 | |
10 missing means |  | 0.01 | 2.92 | 0.06 | 1.89 | 0.04 | 1.00 | −0.02 | 1.62 | |
15 missing means |  | −0.19 | 3.26 | −0.05 | 2.13 | 0.03 | 1.00 | 0.12 | 2.19 |