An augmented data method for the analysis of nosocomial infection data.

An augmented data method for the analysis of nosocomial infection data.
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DOI:
10.1093/aje/kwn176
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发表时间:
2008-09-01
影响因子:
5
通讯作者:
Scott, Geoffrey M.
Scott, Geoffrey M.
中科院分区:
医学2区
文献类型:
--
作者:
Cooper, Ben S.;Medley, Graham F.;Bradley, Susan J.;Scott, Geoffrey M.

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由于两个事实,对传染性病原体的医院感染数据的分析变得复杂。首先,典型的病原体比明显的疾病更常见地导致无症状定植,因此只能通过一系列监测拭子来完全观察到传播,而监测拭子本身的敏感性并不完善。因此,任何给定的一组拭子结果都可以与许多不同的传播模式一致。其次,数据往往具有高度依赖性:一名患者的定植状态会影响其他患者的风险,而且在某些病房,重复入院的现象很常见。在这里,作者提出了一种分析典型医院感染数据的方法,该数据包括任意时间筛查拭子的结果,该方法克服了这些问题,并能够同时估计传播和输入参数、定植持续时间、拭子敏感性以及病房和患者水平的协变量。该方法通过使用机械随机传播模型来解释依赖性,并通过估算重复入院时不完全观察到的患者定植状态来考虑数据的不确定性。该方法使用马尔可夫链蒙特卡罗算法,允许在贝叶斯框架内进行推理。该方法适用于血液科病房中耐万古霉素肠球菌传播的中断时间序列研究的说明性数据。
The analysis of nosocomial infection data for communicable pathogens is complicated by two facts. First, typical pathogens more commonly cause asymptomatic colonization than overt disease, so transmission can be only imperfectly observed through a sequence of surveillance swabs, which themselves have imperfect sensitivity. Any given set of swab results can therefore be consistent with many different patterns of transmission. Second, data are often highly dependent: the colonization status of one patient affects the risk for others, and, in some wards, repeated admissions are common. Here, the authors present a method for analyzing typical nosocomial infection data consisting of results from arbitrarily timed screening swabs that overcomes these problems and enables simultaneous estimation of transmission and importation parameters, duration of colonization, swab sensitivity, and ward- and patient-level covariates. The method accounts for dependencies by using a mechanistic stochastic transmission model, and it allows for uncertainty in the data by imputing the imperfectly observed colonization status of patients over repeated admissions. The approach uses a Markov chain Monte Carlo algorithm, allowing inference within a Bayesian framework. The method is applied to illustrative data from an interrupted time-series study of vancomycin-resistant enterococci transmission in a hematology ward.
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发表时间: 2007-08-22
影响因子: 3.9
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