Epidemiological Research
Methods Questions and
Answers Updated 2027
EpidemiologyB-
BAnswerBTheBstudyBofBtheBdistributionBofBdiseaseBandBdeterminantsBofBhealth-
relatedBstatesBorBeventsBinBspecifiedBhumanBpopulationsBandBtheBapplicationBofBthisB
studyBtoBtheBcontrolBofBhumanBhealthBproblems
ClinicalBEpidemiologyB-
BAnswerBTheBscienceBofBmakingBpredictionsBaboutBindividualBpatientsBbyBcountingBcli
nicalBeventsBinBsimilarBpatients,BusingBstrongBscientificBmethodsBforBstudiesBofBgroups
BofBpatientsBtoBensureBthatBtheBpredictionsBareBaccurate.
RoleBofBinvestigator:B-BAnswerBObservationalB-
BTheBinvestigatorBdoesBnotBmanipulateBexposureBofBparticipantsBtoBriskBfactors.BMost
BepidemiologicalBstudiesBareBobservationalBOR
ExperimentalB-
BAccordingBtoBtheBstudyBdesign,BtheBinvestigatorBmanipulatesBtheBexposureBofBpartici
pantsBtoBsomeBfactor.BClinicalBtrialsBandBinterventionBstudiesBareBexamplesBofBsuchBe
xperiments.BIfBtheBstudyBparticipantsBthemselvesBactBtoBchangeBtheirBexposureBtoBan
Binfluence,BaBnaturalBexperimentBmayBoccur.BForBexample,BaBstudyBofBpersonsBwhoB
haveBmigratedBfromBoneBenvironmentBtoBanotherBcouldBconstituteBaBnaturalBexperim
ent.
PurposeBofBtheBstudy:B-BAnswerBDescriptiveB-
BdescribesBdistributionBofBdiseaseBbyBtime,Bplace,Bperson;BusedBtoBgenerateBhypothes
esBofBdiseaseBcausationBorBforBhealthBplanningBOR
AnalyticB-
BmeasuresBandBtestsBtheBassociationBbetweenBaBhypothesizedBriskBfactorBandBaBdise
ase
Methods Questions and
Answers Updated 2027
EpidemiologyB-
BAnswerBTheBstudyBofBtheBdistributionBofBdiseaseBandBdeterminantsBofBhealth-
relatedBstatesBorBeventsBinBspecifiedBhumanBpopulationsBandBtheBapplicationBofBthisB
studyBtoBtheBcontrolBofBhumanBhealthBproblems
ClinicalBEpidemiologyB-
BAnswerBTheBscienceBofBmakingBpredictionsBaboutBindividualBpatientsBbyBcountingBcli
nicalBeventsBinBsimilarBpatients,BusingBstrongBscientificBmethodsBforBstudiesBofBgroups
BofBpatientsBtoBensureBthatBtheBpredictionsBareBaccurate.
RoleBofBinvestigator:B-BAnswerBObservationalB-
BTheBinvestigatorBdoesBnotBmanipulateBexposureBofBparticipantsBtoBriskBfactors.BMost
BepidemiologicalBstudiesBareBobservationalBOR
ExperimentalB-
BAccordingBtoBtheBstudyBdesign,BtheBinvestigatorBmanipulatesBtheBexposureBofBpartici
pantsBtoBsomeBfactor.BClinicalBtrialsBandBinterventionBstudiesBareBexamplesBofBsuchBe
xperiments.BIfBtheBstudyBparticipantsBthemselvesBactBtoBchangeBtheirBexposureBtoBan
Binfluence,BaBnaturalBexperimentBmayBoccur.BForBexample,BaBstudyBofBpersonsBwhoB
haveBmigratedBfromBoneBenvironmentBtoBanotherBcouldBconstituteBaBnaturalBexperim
ent.
PurposeBofBtheBstudy:B-BAnswerBDescriptiveB-
BdescribesBdistributionBofBdiseaseBbyBtime,Bplace,Bperson;BusedBtoBgenerateBhypothes
esBofBdiseaseBcausationBorBforBhealthBplanningBOR
AnalyticB-
BmeasuresBandBtestsBtheBassociationBbetweenBaBhypothesizedBriskBfactorBandBaBdise
ase