From: Meta-analytic methods for pooling rates when follow-up duration varies: a case study
Study | Intervention Group | Control Group | Duration (Months) | Standardized Effect Size** | ||||
---|---|---|---|---|---|---|---|---|
 | N | Mean ± SD | Rate | N | Mean ± SD | Rate |  |  |
Alexander | 11 | 0.60 ± 0.90 | 0.05 | 10 | 2.40 ± 2.10 | 0.20 | 12 | -1.09 |
Christiansen | 27 | 0.30 ± 1.20 | 0.03 | 15 | 0.20 ± 0.43 | 0.02 | 12 | 0.10 |
Clark | 159 | 1.72 ± 4.20 | 0.14 | 73 | 2.49 ± 6.26 | 0.21 | 12 | -0.16 |
Fireman | 13 | 0.08 ± 1.14 | 0.01 | 13 | 1.00 ± 1.14 | 0.08 | 12 | -0.78 |
Hughes | 44 | 0.45 ± 1.05 | 0.04 | 45 | 0.60 ± 1.05 | 0.05 | 12 | -0.14 |
Lewis | 48 | 2.30 ± 2.98 | 0.19 | 28 | 3.71 ± 2.98 | 0.31 | 12 | -0.47 |
McNabb | 7 | 1.90 ± 4.72 | 0.16 | 7 | 7.40 ± 4.72 | 0.62 | 12 | -1.09 |
Persaud | 18 | 0.27 ± 0.57 | 0.05 | 18 | 1.00 ± 1.20 | 0.20 | 5 | -0.76 |
Ronchetti | 114 | 0.07 ± 0.32 | 0.01 | 95 | 0.23 ± 0.78 | 0.02 | 12 | -0.28 |
Shields | 101 | 0.54 ± 1.68 | 0.05 | 104 | 0.38 ± 1.68 | 0.03 | 12 | 0.09 |
Talabere | 25 | 0.44 ± 0.77 | 0.15 | 25 | 1.08 ± 1.32 | 0.36 | 3 | -0.58 |
Toelle | 63 | 1.51 ± 2.31 | 0.25 | 51 | 1.67 ± 2.40 | 0.28 | 6 | -0.07 |