Table 4 |
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|
Summary Outcome Measures for Emergency Room Visits. |
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|
Measure |
Effect Size |
Confidence Interval |
Effect Size P-value |
Homogeneity Test P-value |
|
|
||||
|
SMDa |
||||
|
Fixed-effects |
-0.21 |
-0.33, -0.09 |
<0.001 |
0.05 |
|
Random-effects |
-0.27 |
-0.45, -0.09 |
0.003 |
0.05 |
|
IRDb |
||||
|
Fixed-effects M-H |
-0.04 |
-0.05, -0.03 |
<0.001 |
<0.001 |
|
Random-effects |
-0.05 |
-0.08, -0.03 |
<0.001 |
<0.001 |
|
IRRc |
||||
|
Fixed-effects M-H |
0.66 |
0.59, 0.74 |
<0.001 |
<0.001 |
|
PR + study indicators |
0.66 |
0.54, 0.81 |
<0.001 |
<0.001 |
|
PR – study indicators |
0.77 |
0.59, 0.99 |
0.039 |
N/A |
|
|
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|
a SMD refers to standardized mean difference and was obtained using both fixed effects and random effects models. b IRD refers to the incidence rate difference, and was obtained using a Mantel-Haenszel procedure to estimate a fixed-effects model and an inverse-variance method to estimate a random-effects model. c IRR refers to the incidence rate ratio and was obtained using Mantel-Haenszel procedure to estimate a fixed effects model and Poisson regression models with Huber-White sandwich estimators with and without study indicators which is equivalent to a random-effects model. |
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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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