單組目標(biāo)值醫(yī)療器械臨床試驗(yàn)設(shè)計(jì)中，目標(biāo)值的定義和構(gòu)建原則是什么

test4

　　與目標(biāo)值比較的單組設(shè)計(jì)需事先指定主要評價(jià)指標(biāo)有臨床意義的目標(biāo)值，通過考察單組臨床試驗(yàn)主要評價(jià)指標(biāo)的結(jié)果是否在指定的目標(biāo)值范圍內(nèi)，從而評價(jià)試驗(yàn)器械有效性/安全性。由于沒有設(shè)置對照組，單組目標(biāo)值設(shè)計(jì)的臨床試驗(yàn)無法確證試驗(yàn)器械的優(yōu)效、等效或非劣效，僅能確證試驗(yàn)器械的有效性/安全性達(dá)到專業(yè)領(lǐng)域內(nèi)公認(rèn)的最低標(biāo)準(zhǔn)。

　　目標(biāo)值是專業(yè)領(lǐng)域內(nèi)公認(rèn)的某類醫(yī)療器械的有效性/安全性評價(jià)指標(biāo)所應(yīng)達(dá)到的最低標(biāo)準(zhǔn)，包括客觀性能標(biāo)準(zhǔn)（Objective performance criteria，OPC）和性能目標(biāo)（Performance goal，PG）兩種。目標(biāo)值通常為二分類（如有效/無效）指標(biāo)，也可為定量指標(biāo)，包括靶值和單側(cè)置信區(qū)間界限（通常為97.5%單側(cè)置信區(qū)間界限）。對臨床試驗(yàn)結(jié)果進(jìn)行統(tǒng)計(jì)分析時(shí)，需計(jì)算主要評價(jià)指標(biāo)的點(diǎn)估計(jì)值和單側(cè)置信區(qū)間界限值，并將其與目標(biāo)值進(jìn)行比較。

　　目標(biāo)值的構(gòu)建通常需要全面收集具有一定質(zhì)量水平及相當(dāng)數(shù)量病例的臨床研究數(shù)據(jù)，并進(jìn)行科學(xué)分析（如Meta分析）。隨著器械技術(shù)和臨床技能的提高，OPC可能發(fā)生改變，需要對臨床數(shù)據(jù)重新進(jìn)行分析以確認(rèn)。

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