Table 3

Summary Outcome Measures for Days of School Absence.

Measure

Effect Size

Confidence Interval

Effect Size P-value

Homogeneity Test P-value


SMDa

Fixed-effects

-0.14

-0.23, -0.04

0.006

0.61

Random-effects

-0.14

-0.23, -0.04

0.006

0.61

IRDb

Fixed-effects M-H

-0.15

-0.19, -0.11

<0.001

<0.001

Random-effects

-0.17

-0.25, -0.08

<0.001

<0.001

IRRc

Fixed-effects M-H

0.86

0.83, 0.90

<0.001

<0.001

PR + study indicators

0.86

0.77, 0.97

0.011

<0.001

PR - study indicators

0.86

0.75, 0.99

0.044

N/A


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.

Guevara et al. BMC Medical Research Methodology 2004 4:17   doi:10.1186/1471-2288-4-17

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