confondente [en] lurking variable [en] [en] Confounding [en] confounding confounding English confounding confounding variables http://en.wikipedia.org/wiki/Confounding [en] [en] English Confounder Confounding confounding confounding confound confounding factors https://en.wikipedia.org/wiki/Confounding [en] Confounding Confounding [en] confounders English Confounding Variable tác nhân chính confounders Confounding confounding factor [en] [en] [en] confounding Confounds confounded confounding variables Confounding Confounding [en] Confounding [en] confounding Confounding Confounding confounding factors [en] [en] lurking and confounding variables confounding confounders Confounding confounding variables procedural confound confounding confounding variables Confounding confounding factors confounding variable English [en] Confounding Confounding confounding variable [en] lurking variable confounding factors [en] confounding variables confounding Confounding confounding variables [en] Confounding [en] Confounding confounding variables confounding [en] confounding variables [en] [en] [en] [en] Confounding [en] Confounding confounding factors confounded confounded Confounding [en] Confounding Confounding variable Confounding Confounding [en] lurking variable lurking variable confounding Confounder confounding confounding variable Confounding bias CONFOUDING confounding Confounding Confounding Confounding confounders lurking and confounding variables confounders Confounding [en] Confounding Confounding [en] [en] [en] Confounding confounding confounding Confounding Confounding 混杂变量 http://en.wikipedia.org/wiki/Confounding confounding variables lurking and confounding variables confounding variables confounding Confounding Confounding [en] confounding variable confounding factors [en] Confounding Confounding lurking and confounding variables Confounding [en] confounding variable [en] confounding confounding factor, hidden variable, lurking variable confounding confounding [en] confounding variables confounding variable lurking variable [en] lurking variable lurking variable Confounding confounding variables confounding factors confounding confounds [en] confounders Confounding bias confounding [en] [en] [en] English http://en.wikipedia.org/wiki/Confounding#Example Confounding confounding variables confounding confounding bias confounding variables [en] confounding variable confounding confounding factors lurking variable confounding factors Confounding lurking variable confounding lurking variable confounding confounding factor [en] confounds confounding Confounding confounding confounder Confounders [en] https://en.wikipedia.org/wiki/... confound Confounding confounding confounding [en] confounding confound Confounding lurking variable Confounding confounding factors [en] confounding variáveis de confusão confounding variables [en] Confounding confounding variables confounding variables confounders confound Confounding Confounding [en] lurking variable confounding variables Confounding Confounding Confounding Confounding confounding variables confounding Confounding confounding variables Confounding types of variables confound confounding variables [en] lurking variable confounding factors confounding variable [en] learn more confounding [en] confounding factors confounding factors Confounding confounding [en] confounding variables confounding variables confounders confounded Confounding [en] confounding confounded [en] confounding variables [en] Confounding confounders http://en.wikipedia.org/wiki/Confounding Confounding confounding factors confounding factors confounding [en] 混淆变量 Confounding confounding variables Confounding [en] [en] Confounding confounding confounding factors [en] [en] lurking variable Confounding [en] confounding Confounding [en] confound confounds Confounding [en] confounder Confounding confounded confound lurking variable vikipèdia en anglès confounding Confounding [en] confounding [en] confounding variables confounding variable Confounding lurking variable confounding confondente http://en.wikipedia.org/wiki/Confounding confound Confounding confounding factors confounders [en] confounding factors confounding confounded Confounding Confounding confounding Confounding WP confounded Confounding lurking and confounding variables confounding factors [en] confounders [en] Confounding confounding variables Confounding Confounding https://en.wikipedia.org/wiki/... Confounding confounding factor English Confounding confounding factors confounding bias confounded confounding variables confounder Confounding [en] confounding confounding bias confounding factors confounding [en] confounds Confounding [en] [en] Confounding [en] confounders Confounding probably not even then confounding Confounding confounding elements [en] confounding variables confounding variables confounds [en] confounding variables confounding variables [en] confounding factors [en] Residual confounding English