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As with the 2009 GSS data, the most that can be drawn from this comparison to our findings is that they are not dramatically different when important differences in the studies are considered.
Although summary estimates of effect from meta-analyses of different indicators of childhood SEP are not directly comparable because of differences in the studies included in each comparison, there was a suggestion that the association of parental education with walking speed was stronger than the association of either father's occupation or childhood economic environment (Figure 4).
Eurosafe has a helpful summary of the evidence on the benefits, which cites a Canadian meta-analysis that adds up all the studies and finds helmets reduce head injuries by between 21 to 45% – the range being due to differences in the studies (some looked only at serious head injuries while others only considered certain ages).
Comparisons among results are impossible given the differences in the studies.
At the present, it will be difficult to determine whether these observations are real or due to methodological differences in the studies.
Beyond methodological differences in the studies, this observed heterogeneity results from the target and design of the QIPs, as well as from variability in physicians' responsiveness to the programs [7 10].
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Thus, in part the different findings could reflect differences in the study design and techniques employed.
The discrepancies between different studies may be explained by demographic differences in the study populations.
Differences in the study selection process also resulted from different inclusion criteria.
There were also some interesting socioecomic differences in the study.
Methodological differences in the study design compared to coastal surveys are discussed.
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