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A full competing risk analysis of hospital-acquired infections can easily be performed by a case-cohort approach.

Abstract：

OBJECTIVES:We provide a case-cohort approach and show that a full competing risk analysis is feasible even in a reduced data set. Competing events for hospital-acquired infections are death or discharge from the hospital because they preclude the observation of such infections. STUDY DESIGN AND SETTING:Using surveillance data of 6,568 patient admissions (full cohort) from two Spanish intensive care units, we propose a case-cohort approach which uses only data from a random sample of the full cohort and all infected patients (the cases). We combine established methodology to study following measures: event-specific as well as subdistribution hazard ratios for all three events (infection, death, and discharge), cumulative hazards as well as incidence functions by risk factor, and also for all three events. RESULTS:Compared with the values from the full cohort, all measures are well approximated with the case-cohort design. For the event of interest (infection), event-specific and subdistribution hazards can be estimated with the full efficiency of the case-cohort design. So, standard errors are only slightly increased, whereas the precision of estimated hazards of the competing events is inflated according to the size of the subcohort. CONCLUSION:The case-cohort design provides an appropriate sampling design for studying hospital-acquired infections in a reduced data set. Potential effects of risk factors on the competing events (death and discharge) can be evaluated.

journal_name

J Clin Epidemiol

journal_title

Journal of clinical epidemiology

authors

Wolkewitz M,Palomar-Martinez M,Olaechea-Astigarraga P,Alvarez-Lerma F,Schumacher M

doi

10.1016/j.jclinepi.2015.11.011

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

187-93

eissn

0895-4356

issn

1878-5921

pii

S0895-4356(15)00541-7

journal_volume

74

pub_type

杂志文章,多中心研究

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