However, over the time period in which the researchers noted the children's behavioral issues and smoke exposure, their parent exposure would have correlated with the smoke exposure too. The fact that 20 and 30 years ago, far more parents smoked around their children (not to mention than children spent far more time at home) further confounds any conclusions that might have been reached by this study.
further confounds any conclusions that might have been reached by this study.
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Evidently in plenty of minds hereon.
Not in mine. I can recognize when other factors are held more or less constant or more or less randomized.
I find the study uncommonly straight-forward and clean.
I recognize that clean is not to be construed as an automatic and reliably cherished value of whatever percentage of smokers, however.