Table 2 |
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|
Characteristics of Studies Reporting on Emergency Room Visits.* |
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|
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 |
|
|
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|
* N refers to the sample size, Mean ± SD refers to the mean number of events ± standard deviation, and rate refers to the total events per person-month. ** Standardized effect size was calculated for each study by subtracting control group mean from intervention group mean and dividing by the pooled SD. |
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|
Guevara et al. BMC Medical Research Methodology 2004 4:17 doi:10.1186/1471-2288-4-17 |
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