醫(yī)生JamesLind同

服用大蒜、芥末籽、玄參素、秘魯香液和沒(méi)藥樹(shù)脂

JamesLind(1716-VitC隨機(jī)

隨機(jī)

隨機(jī)

隨隨機(jī) 組組

隨機(jī)隨訪 施后，隨訪并比較兩組人群的發(fā)病()情況或隨機(jī) 群組

clinicaltrial,(true(true對(duì)照干預(yù)前瞻

分 析 性 研 究檢驗(yàn)假設(shè)能力檢驗(yàn)假設(shè)能力 (true(true(true(clinical（randomizedcontrolledtrial/randomizedclinical(clinical

Populationofpatientsasdefinedbyeligibilitycriteria(populationP)(sampleA)Formalentrytotrial(patientsagreeingtoparticipate:sampleB)

Eligiblepatientswho,forsomereason,werenotenteredinthetrial(oftenrefusedTreatmentgroup Treatmentgroup (樣本

符合診斷標(biāo)準(zhǔn)的因(不同意參與試驗(yàn)) 合格人群(apopulationofeligible （agroupofpatientsrecruitedfromthispopulation)least)twotreatmentgroups)isbyrandomization) emeasuresinthetreatmentgroupsarecomparedattheendofthe設(shè)立同期對(duì)照（theneedforconcurrent隨機(jī)分配(allocationat ： P P：2 2 (1-EpiCalcEpiCalcEpiCalc：2(ZZ)2： d(1-EpiCalcEpiCalc設(shè)立同期對(duì)照（theneedforconcurrent隨機(jī)分配(allocationat（theneedforconcurrent （theneedforconcurrent （theneedforconcurrent 123（theneedforconcurrent （theneedforconcurrent cebo–1958手術(shù)治療502-6 對(duì)照設(shè)置的問(wèn)題益，如果對(duì)照組不給予治療，就存在學(xué)問(wèn)題，因此 Obstructivecoronary Excimerlasercoronary Balloonangio arterydisease (Appelmanet 準(zhǔn)分子激光冠狀動(dòng)脈血?dú)馇驍U(kuò)張血管成形(cockburnetal.,Diabetesmellitusinchildhoodandal.,1989)

Specialeducationclassesinadditiontousualclinicvisits

cebousualclinicvisits設(shè)立同期對(duì)照（theneedforconcurrent隨機(jī)分配(allocationatAllocationat AllocationatAllocationatAllocationat

Allocationat、AllocationatAllocationat設(shè)立同期對(duì)照（theneedforconcurrent隨機(jī)分配(allocationat

檢查的頻度； 講可以完全消除各方面的因素，避免了常復(fù)雜，幾乎難以實(shí)現(xiàn)。

X2 nSD X X

?

標(biāo)????抗體幾何平?

?