Which of these defines the extent to which you believe that the person being observed behaves in a similar fashion when confronted?

Catalogue of Bias

Which of these defines the extent to which you believe that the person being observed behaves in a similar fashion when confronted?

When individuals modify an aspect of their behaviour in response to their awareness of being observed.

Table of Contents

Background

The Hawthorne effect occurs when people behave differently because they know they are being watched.

It can affect all sorts of behaviours such as dietary habits, or hygiene practices because these have considerable opportunity for instantaneous modification. It can also affect study results, e.g. a survey of smoking by watching people during work breaks might lead to observing much lower smoking rates than is genuinely representative of the population under study. It can also contaminate an intervention study if one of the control groups changes its behaviour because it is being observed more frequently than the other.

The original Hawthorne study looked at changing the amount of light at the Hawthorne Works and its impact on working practices. The increased attention focussed on the workers as part of the study led to temporary increases in production (the Hawthorne effect) as opposed to changes in working practices

The Hawthorne effect can also lead to the observation being the intervention. For example, recommending individuals who want to lose weight should keep a diary of what they eat and drink.

Example

A study of hand-washing among medical staff found that when the staff knew they were being watched, compliance with hand-washing was 55% greater than when they were not being watched (Eckmanns 2006).

In a study of dementia patients, more intensive follow-up (comprehensive assessment visits at baseline and 2, 4 and 6 months) in a clinical trial of Ginkgo biloba resulted in a better cognitive functioning outcomes than minimal follow-up (abbreviated assessment at baseline and full assessment at 6 months). (McCarney R 2007)

Impact

A systematic review investigating the impact of the Hawthorne effect identified 19 studies evaluating the behaviour of participants aware they were being studied (McCambridge 2014). These 19 studies showed a wide range of variation in the proposed Hawthorne effect, and no summary of the overall impact of the Hawthorne effect could be calculated. Nevertheless, the authors stated that “research participation can and does influence behaviour, at least in some circumstances.”

Another study examined the magnitude of the Hawthorne effect on compliance with a hand-hygiene protocol and collected alcohol hand-rub dispensers electronically (so that participants would not be aware of being observed or measured) as well as by human observers (Hagel 2006). The study recorded five hand hygiene events per patient per hour during periods of observation and two hygiene events per patient per hour in the periods without observation  – 61% of the observed total variability in hand hygiene events was explained by the presence or absence of a direct observer – the Hawthorne effect.

Preventive steps

Studies using hidden observation can help avoid the Hawthorne effect, although even knowledge of participation in a study per se is thought to have the potential to induce a Hawthorne effect (Persell 2016).

Sources

Eckmanns T, et al. Compliance with antiseptic hand rub use in intensive care units: the Hawthorne effect. Infect Control Hosp Epidemiol. 2006 Sep;27(9):931-4

Gould DJ, et al. Impact of observing hand hygiene in practice and research: a methodological reconsideration. J Hosp Infect. 2017 Feb;95(2):169-174. doi: 10.1016/j.jhin.2016.08.008

Hagel S, et al. Quantifying the Hawthorne effect in hand hygiene compliance through comparing direct observation with automated hand hygiene monitoring. Infect Control Hosp Epidemiol. 2015 Aug;36(8):957-62. doi: 10.1017/ice.2015.93

McCambridge J et al. Systematic review of the Hawthorne effect: new concepts are needed to study research participation effects. J Clin Epidemiol 2014;67:267–77

McCarney R, Warner J, Iliffe S, van Haselen R, Griffin M, Fisher P. The Hawthorne Effect: a randomised, controlled trial. BMC Med Res Methodol. 2007 Jul 3;7:30.

Persell et al.  Behavioral interventions to reduce inappropriate antibiotic prescribing: a randomized pilot trial. BMC Infect Dis. 2016 Aug 5;16:373. doi: 10.1186/s12879-016-1715-8

Sackett DL. Bias in analytic research. J Chron Dis 1979; 32: 51-63

Sedgwick P, Greenwood N. Understanding the Hawthorne effect. BMJ. 2015 Sep 4;351:h4672. doi: 10.1136/bmj.h4672


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