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Effect modifier like hemorrhagic stratification was compared with QTc prolongation.
It all depends on the distribution of effect modifiers. BMC Med 2013;11:159.
The results obtained in the present study do not clarify the role of SES as an effect modifier of the association between mortality and variation in [NO.sub.2].
We used the results of the individual city analysis in a second-stage analysis to provide overall estimates and to investigate potential effect modifiers.
Current and future efforts to identify new polymorphisms in genes involved in environmental response will broaden the scope of potential genetic effect modifiers. Determining the effect of these polymorphisms (phenotype) will then be of paramount importance.
Effect modifiers such as age and gender were controlled by stratification using Chi-square test.
Drinking water sodium concentrations were measured using the atomic absorption flame photometry method with an air-acetylene flame (see Supplemental Material, "Confounders and effect modifiers") and multiplied by self-reported water volume intake in glasses per day; data collectors measured the volume of presented glasses.
RVR was also stratified among age, viral load and gender to see their effect as these are potential effect modifiers. All information/ data was recorded on performa for analysis.
The objective was to quantify the effect of [greater than or equal to] 3 g OBG/d on serum cholesterol concentrations in humans and investigate potential effect modifiers. A meta-analysis was performed on 28 RCTs comparing [greater than or equal to] 3 g OBG/d with an appropriate control.
After examining the prevalence of hypoglycemia across potential effect modifiers, however, they found no significant interactions.
In addition, three variables were identified a priori as either confounders or effect modifiers: hours per day spent outdoors, years of pre-study residence length at enrollment address, and moving distance from enrollment address during follow-up.