What you'll learn

• What screening and brief intervention means in health psychology.
• How Pengpid et al. used a randomised controlled trial with South African hospital out-patients.
• The key aim, procedure, findings and conclusions you need for AO1.
• How to evaluate the study for methodology, ethics and real-world application.

Why this study matters

Pengpid et al. (2012) is the contemporary study for the Health Psychology option. It focuses on hazardous and harmful alcohol use, and asks a very applied question: can hospitals identify risky drinkers and help them reduce alcohol use through a short intervention?

This makes it useful for essay answers because it links psychology to public health, addiction, prevention, and behaviour change.

Key background concepts

Alcohol use: hazardous, harmful and dependent

Not all alcohol use is treated the same in health research.

This study was not mainly about severe alcohol dependence. It targeted people whose drinking was risky enough to need help, but who could realistically be supported through a short hospital-based intervention.

Screening

Pengpid et al. used an alcohol screening tool called the AUDIT, the Alcohol Use Disorders Identification Test. It is a questionnaire developed by the World Health Organization to assess drinking frequency, alcohol-related problems and signs of dependence.

Brief intervention

Brief interventions often include personalised feedback, advice about risks, encouragement to take responsibility, goal-setting and discussion of coping strategies. In this study, the brief intervention was designed to be realistic for busy hospital settings.

Research design: a randomised controlled trial

Pengpid et al. used a randomised controlled trial, often shortened to RCT.

The intervention group received the brief alcohol intervention. The control group did not receive the same intervention, so the researchers could compare whether the intervention made a difference.

The independent variable was the condition participants were allocated to: brief intervention or control. The dependent variables were alcohol-related outcomes, such as AUDIT score and reported drinking behaviour at follow-up.

AO1: Aim of the study

The aim was to investigate whether screening and brief intervention could reduce hazardous and harmful alcohol use among hospital out-patients in South Africa.

The wider context is important: alcohol misuse is a major public health issue in South Africa, linked to accidents, violence, illness and pressure on health services. Hospitals may therefore be a useful place to identify people at risk.

AO1: Sample

Participants were adult hospital out-patients in South Africa.

Patients were screened using the AUDIT. Those whose scores suggested hazardous or harmful alcohol use were eligible for the trial, assuming they met the study criteria and gave consent.

The sample is a strength because it used real patients in a real healthcare setting. However, it also means the findings may not generalise perfectly to people who do not attend hospitals, or to countries with different healthcare systems and drinking cultures.

AO1: Procedure

The study followed a clear sequence.

1. Hospital out-patients were approached and screened for alcohol use.
2. Those identified as hazardous or harmful drinkers completed baseline measures.
3. Participants were randomly allocated to either:
   • a brief intervention condition, or
   • a control/usual care condition.
4. The intervention involved a short alcohol-focused discussion, including feedback and advice about reducing drinking.
5. Participants were followed up later, commonly reported as around 6 and 12 months, to assess whether their drinking had changed.

The researchers compared alcohol outcomes between the groups over time.

AO1: Findings and conclusions

Pengpid et al. found that alcohol use tended to reduce over time, with evidence that brief intervention could help reduce risky drinking among hospital out-patients. However, the effects were not necessarily dramatic across every measure, and reductions can also occur because screening and follow-up themselves make people reflect on their drinking.

The main conclusion is that hospital settings can be used to identify hazardous and harmful drinkers, and that brief interventions may be a useful, low-cost public health tool.

Research methods link

Because this was a trial comparing groups, the researchers were interested in whether differences between conditions were statistically meaningful.

In A-Level research methods, you should know that a test of difference is used when comparing groups or conditions. For example, Mann-Whitney U is used for a difference between two independent groups, while Wilcoxon signed-ranks is used for related data, such as before-and-after scores from the same participants. Spearman’s rho is used for correlation, and chi-square is used for association between categories.

The usual significance level is $p\le .05$, though researchers may use $p\le .10$ or $p\le .01$ depending on how strict they want to be. With critical-value tables, always check whether the observed value needs to be greater than or less than the critical value, because this differs between tests.

AO3: Strengths

Strong control through random allocation

Random allocation improves internal validity because participant variables, such as motivation, severity of drinking or general health, should be spread more evenly across groups.

This makes it easier to argue that differences in outcome were caused by the intervention rather than pre-existing differences.

Real-world setting

The study has good ecological validity because it was conducted with real hospital out-patients. The intervention was also short, which makes it realistic for healthcare professionals to deliver.

This supports real-world application: if hospitals can screen patients quickly and provide brief advice, public health services may reduce alcohol-related harm without relying only on specialist addiction clinics.

Use of a standardised measure

AUDIT is a recognised alcohol screening tool. This improves reliability because participants are assessed using the same structured questions rather than informal judgement.

AO3: Weaknesses

Self-report data

Alcohol consumption was measured largely through self-report. Participants may under-report drinking because of embarrassment, memory problems or social desirability bias.

This is especially relevant when the topic is alcohol misuse, because drinking can be socially sensitive or stigmatised.

Attrition at follow-up

Longitudinal studies often lose participants between baseline and follow-up. If heavier drinkers were more likely to drop out, the final results may make the intervention look more successful than it really was.

Generalisability

The study was carried out in South African hospital out-patients. This is valuable because psychology should not only rely on Western student samples, but the findings may not apply equally to other countries, age groups, rural communities or people with severe alcohol dependence.

Ethics

The study involved a sensitive health behaviour, so ethical safeguards were important.

Under the BPS Code of Ethics and Conduct (2009), researchers should consider consent, deception, right to withdraw, protection from harm, confidentiality and debriefing.

Participants should have been informed about the study, given the right to withdraw, and reassured that their alcohol data would be confidential. Because the study identified risky drinking, researchers also had a duty to protect participants from harm by giving appropriate advice or referral routes where needed.

Using this study in essays

For AO1, describe the aim, sample, RCT design, AUDIT screening, brief intervention and follow-up.

For AO2, apply it to a scenario about a hospital, GP clinic, university wellbeing service or public health campaign trying to reduce harmful drinking.

For AO3, evaluate the use of random allocation, real-world setting, self-report measures, attrition, cultural context and ethics.