Results to date are promising and this relatively young field is now close to a point where these kinds of cognitive interventions can be recommended to educators. Further research with refined methodology and more diverse samples is required before firm recommendations may be made for medical education and policy; however, these results suggest that such interventions hold promise, with much current enthusiasm for new research.

Objectives: To synthesize the literature describing compliance with WHO hand hygiene (HH) guidelines in Intensive Care Units (ICUs), to evaluate the quality of extant research, and to examine differences in compliance rates across geographical regions, ICU types, and healthcare worker groups, observation methods, and Moments (indications) of HH. Data sources: Electronic searches were conducted in August 2018 using Medline, CINAHL, PsycInfo, Embase, and Web of Science. Reference lists of included studies and related review articles were also screened. Study selection: English-language, peer-reviewed studies measuring HH compliance by healthcare workers in an ICU setting using direct observation guided by the WHO's 'Five Moments of Hand Hygiene', published since 2009, were included. Data extraction: Information was extracted on study location, research design, type of ICU, healthcare workers, measurement procedures, and compliance rates. Data synthesis: Sixty-one studies were included. Most were conducted in high-income countries (60.7%) and in adult ICUs (85.2%). Mean HH compliance was 59.6%. Compliance rates appeared to differ by geographic region (high-income countries 64.5%, low-income countries 9.1%), type of ICU (neonatal 67.0%, pediatric 41.2%, adult 58.2%), and type of healthcare worker (nursing staff 43.4%, physicians 32.6%, other staff 53.8%). Conclusions: Mean HH compliance appears notably lower than international targets. The data collated may offer useful benchmarks for those evaluating, and seeking to improve, hand hygiene compliance in ICUs internationally.

Psychometric Evaluation of a Measure of Factors Influencing Hand Hygiene Behaviour to Inform Intervention Background. Although the hand hygiene (HH) procedure is simple, the related behaviour is complex and is not readily understood, explained, or changed. There is a need for practical tools to provide data that can guide healthcare managers and practitioners not only on the 'what' (the standards that must be met), but also the 'how' (guidance on how to achieve the standards). Aim. To develop a valid questionnaire to evaluate attitudes to the factors that influence engagement in HH behaviour that can be readily completed, administered, and analysed by healthcare professionals to identify appropriate intervention strategies. Construct validity was assessed using confirmatory factor analysis, predictive validity through comparison with selfreported HH behaviour, and convergent validity through direct unit-level observation of HH behaviour. Methods. The Capability, Opportunity, Motivation-Behaviour (COM-B) model was used to design a 25-item questionnaire that was distributed to Intensive Care Unit (ICU) personnel in Ireland. Direct observation of HH behaviour was carried out at two ICUs. Findings. A total of 292 responses to the survey (response rate 41.0%) were included in the analysis. Confirmatory factor analysis resulted in a 17-item questionnaire. Multiple regression revealed that a model including Capability, Opportunity, and Motivation, was a significant predictor of self-reported Behavioural intention (F(3,209) =22.58, p<0.001). However, the Opportunity factor was not found to make a significant contribution to the regression model. Conclusion. The COMB HH questionnaire is reliable and valid and provides data to support the development, and evaluation, of HH interventions that meet the needs of specific healthcare units.

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