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Drinking patterns and the distribution of alcohol-related harms in Ireland: evidence for the prevention paradox
BMC Public Health volume 19, Article number: 1323 (2019)
According to the prevention paradox, the majority of alcohol-related harms in the population occur among low-to-moderate risk drinkers, simply because they are more numerous in the population, although high-risk drinkers have a higher individual risk of experiencing alcohol-related harms. In this study we explored the prevention paradox in the Irish population by comparing alcohol-dependent drinkers (high-risk) to low-risk drinkers and non-dependent drinkers who engage in heavy episodic drinking (HED).
Data were generated from the 2013 National Alcohol Diary Survey (NADS), a nationally representative cross-sectional survey of Irish adults aged 18–75. Data were available for 4338 drinkers. Respondents dependent on alcohol (as measured by DSM-IV criteria), respondents who engaged in monthly HED or occasional HED (1–11 times a year) and low-risk drinkers were compared for distribution of eight alcohol-related harms.
Respondents who were dependent on alcohol had a greater individual risk of experiencing each harm (p < .0001). The majority of the harms in the population were accounted for by drinkers who were not dependent on alcohol. Together, monthly and occasional HED drinkers accounted for 62% of all drinkers, consumed 70% of alcohol and accounted for 59% of alcohol-related harms.
Our results indicate that the majority of alcohol consumption and related harms in the Irish population are accounted for by low- and moderate-risk drinkers, and specifically by those who engage in heavy episodic drinking. A population-based approach to reducing alcohol-related harm is most appropriate in the Irish context. Immediate implementation of the measures in the Public Health (Alcohol) Act (2018) is necessary to reduce alcohol-related harm in Ireland.
Alcohol use is the seventh leading risk factor for both deaths and disability-adjusted life years globally and is the leading risk factor among those aged 15–49 . Recent research indicates that there is no level of consumption at which alcohol is not harmful to health . Social harms arising from alcohol consumption, such as damage to work and home life, may also constitute a significant burden to drinkers [2,3,4]. Ireland has one of the highest per-capita alcohol consumption rates in the European Union, with alcohol consumption and hazardous drinking patterns in Ireland projected to increase over the next decade .
The selection of an appropriate target population represents a significant challenge to the design and implementation of polices aimed at reducing alcohol consumption and related harms. Two different, although not mutually exclusive, policy approaches are generally taken in order to reduce alcohol-related harm [4, 6]. A high-risk approach targets a small number of high-risk drinkers, while a population-based strategy aims to reduce alcohol-related harms through interventions targeted at the whole population. Lobbyists representing the alcohol industry often argue that policies to reduce alcohol-related harm should be based exclusively on the former, high-risk approach . However, Krietman  and subsequent researchers [6, 9,10,11,12] have demonstrated that the majority of alcohol-related harms tend to occur among low and moderate-risk drinkers, simply because they are more numerous in the population than high-risk drinkers, who still have a higher individual risk of experiencing harms. This phenomenon is known as the ‘prevention paradox’ .
The prevention paradox has been found to hold true across a range of populations [12,13,14,15,16] when risk is defined in terms of volume of alcohol consumed. However, alcohol-related harms are not only related to volume of alcohol consumed, but also to patterns of drinking, and specifically occasions of heavy episodic drinking (HED) [4, 12,13,14], typically defined as consuming more than 60 g of pure alcohol in a single sitting . Studies have demonstrated that when occasions of HED are taken into account, the prevention paradox is either weakened or disappears entirely [9,10,11, 13, 14]. These findings imply that most alcohol-related harms are due to periods of acute intoxication, and because these occasions are most numerous among low and moderate risk drinkers, they account for the majority of alcohol-related harms. This has been referred to as the “second-order” prevention paradox [6, 14, 15].
The distribution of alcohol consumption and harms may play out in a unique way in the Irish context, given the high HED, high volume pattern of consumption . Ireland’s per capita consumption is sixth highest among 36 Organisation for Economic Co-operation and Development (OECD) countries . Findings from a 2013 national household survey on alcohol consumption indicated that 75% of alcohol in Ireland is consumed as part of an occasion of HED . The Public Health (Alcohol) Act (2018)  has recently been passed and will introduce a number of population-based strategies to reduce alcohol consumption in Ireland. However, many of these measures have yet to be enacted. Determining the distribution of harms across drinking patterns in Ireland is important in order to establish if a population-based approach is best-suited to reducing alcohol-related harms.
Therefore, the primary aim of the study was to identify patterns of alcohol consumption in Ireland, and how alcohol-related harms are distributed across the population in relation to these drinking patterns. A secondary aim was to investigate whether the prevention paradox is supported in an Irish context when high-risk drinkers are defined as those who meet the criteria for alcohol dependence.
Sampling and study population
Data were generated from the National Alcohol Diary Survey (NADS) . The NADS was a nationally representative cross-sectional survey of a stratified clustered sample of 5991 individuals aged 18–75 years living in private households in Ireland. The sampling frame used for the study was the An Post/Ordnance Survey Ireland GeoDirectory database, a list of all addresses in the Republic of Ireland, distinguishing between commercial and residential dwellings. A multi-stage probability approach to sampling was used. The first stage involved the selection of geographical areas. The second stage involved stratifying the sample according to social class and degree of urbanity to ensure that selected geographical locations were representative of the population. All households selected through this sampling process were visited during the fieldwork period and all adults aged 18–75 years in each household were invited to participate.
Respondents completed a face-to-face interview and self-completed questionnaire. Interviews were administered in participants’ own homes by professional social interviewers via a Computer Assisted Personal Interview (CAPI). Interviews were completed between July and October 2013; the household response rate was 67.2% and the within household response rate was 77.1%. The survey was granted ethical approved by the Royal College of Physicians of Ireland and all participants gave written informed consent for their data to be used for research purposes.
Number of standard drinks consumed in last week
Over two-thirds (69.1%, n = 2997) of those who consumed alcohol in the last 12 months also consumed alcohol in the week prior to the survey. Participants were asked to report all alcohol consumed in the week prior to survey. A standard drink in Ireland contains 10 g of pure alcohol and is equivalent to half a pint of beer, a single pub measure of spirits (35 ml), or a small (100 ml) glass of wine. Respondents were provided with beverage-specific flash cards so they could accurately report how many standard drinks they consumed.
Heavy episodic drinking
For the purpose of this study, heavy episodic drinking (HED) was defined as consuming 60 g or more of pure alcohol in a single drinking occasion . Respondents were asked how frequently they consumed six or more standard drinks on a single occasion and given the following response options: “everyday”, “5–6 times a week”, “4 times a week”, “3 times a week”, “twice a week”, “once a week”, “2–3 times a month”, “once a month”, “6–11 times a year”, “2–5 times a year”, “once in the last 12 months” and “never”.
Alcohol dependence was defined according to DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, 4th Edition) criteria, and was measured via self-completed questionnaire using the ten items that denote alcohol dependence from the Composite International Diagnostic Interview . Alcohol dependence was established from a positive response in three or more of the seven domains on the DSM-IV diagnostic criteria in the 12 months before the interview. Only participants who had complete information on both the DSM-IV and on frequency of heavy episodic drinking (HED) were included in the analyses (n = 4338).
Classification of drinkers
Current drinkers were defined as those who had consumed alcohol on at least one occasion in the last year. Non-drinkers (n = 1236, 20.6%), defined as those who had not consumed any alcohol in the last 12 months, were excluded from the analyses. Drinkers were placed into one of the four categories below based on frequency of HED and whether they met the criteria for alcohol dependence:
Respondents who met the DSM-IV criteria for alcohol dependence were classified as dependent drinkers (n = 299, 6.9%).
Respondents who reported consuming six or more standard drinks at least once a month and who did not meet the DSM-IV criteria for dependence were classified as monthly HED drinkers (n = 1368, 31.5%).
Respondents who did not meet the DSM-IV criteria for alcohol dependence and reported consuming 6 or more standard drinks between 1 and 11 times in the previous year were classified as occasional HED drinkers (n = 1326, 30.6%).
Drinkers who did not meet the criteria for dependence and who had not engaged in HED on any occasion in the last year were defined as low-risk drinkers (n = 1345, 31.0%).
Questions on eight alcohol-related harms were included in the survey. These questions were based on the “adverse social consequences of own alcohol use” from the Standardized Measurement of Alcohol-Related Troubles (SMART), a set of guidelines for the standardisation of drinking population surveys in Europe . Respondents were given the response options of “yes, once” “yes, more than once” and “no” as to whether they had experienced each of the harms in the last 12 months. The eight harms covered were harm to finances, harm to health, harm to work or study, harm to friendships or social life, harm to home life or marriage, been in a physical fight, been in an accident, and stopped by the police. E.g., “Have you experienced harms to your finances in the last 12 months due to your own drinking?”
Calculation of total number of alcohol-related harms
The total number of harms from drinking experienced by respondents in the survey was estimated by creating a 16-point scale based on the eight alcohol-related harm questions. Participants were assigned a score of 0 (“never”) 1 (“yes, once”) or 2 (“yes, more than once”) on each of the eight questions depending on their response. Scores on each of the eight harm questions were summed to give each participant a total score of harms that ranged from 0 to 16. Respondents’ scores were summed to create a total number of harms across the survey sample. This score is likely to be an under-estimation of harms, as “more than once” could equate to a number greater than 2. However, the purpose of obtaining the total harm experienced by the survey population was not to provide a precise estimate of the number of alcohol-related harms in the population but was to estimate how the harms were distributed across each drinker type. Hence the scoring of the scale in this way was appropriate to the aim of the study.
Statistical analyses were carried out using Stata version 15 (Stata Corporation, College Station, TX, USA) for Windows. Data were weighted with respect to age, gender and regional distribution to ensure they were nationally representative. With consideration for missing values, only valid percentages are reported. Descriptive statistics were used to describe the median (inter-quartile range) and total number of standard drinks consumed by respondents. Associations between socio-demographic variables and drinker type were analysed by cross-tabulations and significance was assessed by the Pearson χ2 test. Socio-demographic variables analysed were age, gender, employment, marital status and income. Associations between drinker type and each of the harms experienced from own drinking were analysed by cross-tabulations, using the Pearson χ2 test to test for statistical significance. For all analyses an alpha level of p < .05 was considered to be statistically significant.
Characteristics of current drinkers by drinker type
The bivariate associations between socio-demographic characteristics and drinker-type are presented in Table 1. Of the 4338 respondents included in the analyses, there was a relatively even breakdown of low-risk (31.0%), occasional HED (30.6%), and monthly HED (31.5%) drinkers. Dependent drinkers constituted 6.9% of all drinkers in the study. A higher proportion of males were classified as monthly HED drinkers and dependent drinkers (p < .0001). The proportion of monthly HED drinkers and dependent drinkers were highest among the two youngest age groups (p < .0001). Just over 70% of dependent drinkers were aged between 18 and 34. Being a student was associated with engaging in HED and being dependent on alcohol (p < .0001). A similar proportion of high-income and low-income earners were reported to be occasional HED or monthly HED drinkers. However, there was a significantly higher proportion of low-income earners (62.0%) compared to high-income earners (38.0%) in the alcohol-dependent group. There was a significant association (p < .0001) between being dependent on alcohol or engaging in HED and age of first alcohol use. Over 80% of those meeting the criteria for alcohol dependence, and over 70% of monthly HED drinkers had consumed alcohol before the age of 18.
Association between drinker type and harms from own drinking
Overall 29% (n = 1206) of drinkers experienced at least one harm from their own drinking in the last year. As seen in Table 2, experiencing harm to finances was the most frequently reported harm (19.3%) followed by harm to health (15.8%). Being in an accident (6.8%) and being stopped by the police (6.2%) were the least frequently reported harms. There was a linear increase between type of drinker and the frequency of reporting each of the eight harms. For all eight harms, dependent drinkers reported the highest frequency, followed by monthly HED drinkers, occasional HED drinkers and finally, low risk drinkers.
The “yes, once” and “yes, more than once” response options were combined to display the frequency of drinkers who had reported experiencing that harm at least once in the last 12 months. Figure 1 illustrates the linear association between drinker type and experiencing each of the eight harms, with the proportion of harms lowest among low-risk drinkers (3.7–7.3%) and highest among those who were alcohol dependent (19.0–71.7%). The proportion of harms experienced by low-risk drinkers, occasional HED drinkers, and monthly HED drinkers was relatively low, with proportions increasing substantially among those dependent on alcohol (Fig. 1).
Distribution of harms among drinkers in the survey
The distributions of alcohol-related harms as a percentage of all drinkers are displayed in Fig. 1 and Additional file 1: Table S1. For example, of those who experienced at least one harm to their finances in the last year, 8.4% were low-risk drinkers, 23.5% were occasional HED drinkers, 42.7% were monthly HED drinkers, and 25.4% were dependent drinkers (Fig. 1(ii)). Although individual risk of experiencing alcohol-related harm was highest among dependent drinkers, Fig. 1 illustrates that monthly HED drinkers accounted for the highest proportion of harms among drinkers (31.5–42.7%). Occasional HED drinkers accounted for between 19.8 and 27.4% of the harms, while dependent drinkers accounted for between 21.0 and 30.9% of the eight harms. Low-risk drinkers accounted for between 8.4 and 18.6% of harms.
Table 3 displays the total number of harms experienced across the four drinker types. Monthly HED drinkers accounted for the greatest proportion of the harms (34.7%). Together, occasional HED drinkers and monthly HED accounted for over half (58.7%) of the harms in the population. Dependent drinkers accounted for just over one-quarter of the harms (27.4%) and low-risk drinkers accounted for the fewest number of harms (13.9%).
Total amount of alcohol consumed in the week prior to the survey
A total of 37,236 standard drinks were consumed by respondents in the week prior to the survey (Table 4). There was a linear association between drinker type and median number of standard drinks consumed in the last week. Dependent drinkers drank a median of 19.2 (IQR: 10.3–34.4) standard drinks in the week prior to the survey, and accounted for almost one-fifth of the alcohol consumed during the same period. Monthly HED drinkers reported drinking less (Median: 13.2; IQR: 7.8–21.5), but accounted for over half of the alcohol consumed. Together, occasional and monthly HED drinkers accounted for almost three-quarters of alcohol consumed in the week prior to the survey (71.29%).
In this nationally representative study of 4338 respondents, it was found that high-risk drinkers, defined as those who met DSM-IV criteria for alcohol dependence, accounted for approximately 7% of all drinkers. This group had the greatest individual risk of experiencing all eight alcohol-related harms, but accounted for just over one-quarter (27%) of all harms experienced by survey respondents and one-fifth (19%) of all alcohol consumed in the week prior to the survey. Monthly HED drinkers represented almost one-third of all drinkers, consumed 51% of the alcohol and accounted for just over one-third (35%) of the harms. Monthly and occasional HED drinkers combined accounted for 62% of all drinkers, consumed 70% of the alcohol and accounted for 59% of the harms. Low-risk drinkers, defined as those who did not engage in HED in the last year and did not meet the DSM-IV criteria for alcohol dependence, accounted for 31% of all drinkers, 9% of alcohol consumed in the last week and 14% of the harms.
These findings provide evidence for both the prevention paradox and the “second order” prevention paradox in the Irish population when the high-risk group is defined in terms of alcohol dependence. In line with previous findings on the prevention paradox, the majority of harms occurred to low-risk or moderate-risk drinkers, although dependent drinkers had a much higher individual risk of experiencing alcohol-related harms [6, 8, 11, 14, 16]. In support of the “second order” prevention paradox, the majority of the harms were accounted for by people who engaged in HED [9, 10, 12,13,14,15]. This is consistent with findings from other countries. For example, in a study of adolescent drinking in 23 European countries, Danielsson et al.  reported that in almost all countries, heavy episodic drinkers in the bottom 90% of consumers by volume accounted for the majority of alcohol-related harms. Caetano and colleagues [9, 10] reported similar findings in a population-based sample of adults in Brazil and amongst a sample of Hispanic American adults. As with our data, these findings imply that most alcohol-related-harms are due to periods of acute intoxication, and because these occasions are most numerous among low and moderate drinkers, they account for the majority of alcohol-related harms [6, 13, 14].
Despite alcohol dependence being associated with the most detrimental alcohol-related health and social consequences [3, 4, 24], few studies have included dependence as a drinking pattern when examining the validity of the prevention paradox. In an exception to this case, Dawson  investigated the association between alcohol consumption, incidence of drink-driving, and alcohol dependence amongst a population-based sample of US adults. Dawson  reported that approximately 10% of the sample met DSM-IV criteria for alcohol dependence and accounted for the majority (57%) of incidents of drink driving in the last 12 months. However, our findings indicate that the majority of harms in the Irish population were not accounted for by dependent drinkers. This is possibly due to the high prevalence of HED among non-dependent drinkers in this study. The majority of non-dependent drinkers had engaged in at least one episode of HED in the last year, considerably higher than findings from other countries [10, 12, 14] indicating that this pattern of consumption is the norm in Ireland. Of note, low-risk drinkers accounted for a considerable minority of the harms (14%), indicating that low-risk does not equate to “no risk” when it comes to alcohol consumption.
Strengths and limitations
This study had a number of key strengths. Firstly, the large sample size and stratified clustering approach to sampling meant that the survey was based on a representative sample and so the results can be generalised to the whole Irish population. HED and alcohol dependence were measured using validated and reliable questionnaires, strengthening the validity and reliability of the findings. Defining the high-risk group in terms of alcohol dependence, and examining the validity of the prevention paradox in terms of patterns of drinking rather than volume of alcohol consumed, was a novel way of studying the prevention paradox.
Despite these strengths, the findings of this study must be interpreted in the light of several methodological limitations. Although our findings are based on a nationally representative sample, response bias may have been an issue. General population surveys often fail to capture the heaviest drinkers . Self-report bias is a common feature of alcohol consumption surveys and may result in under-estimation of alcohol consumption [27, 28]. Previous analyses demonstrated that the NADS survey accounted for just 39% of recorded alcohol sales in the year it was carried out . This is despite explaining the concept of a standard drink in detail to respondents and providing corresponding visual aids. Furthermore, alcohol-related harms in this study were self-reported and so may also be subject to self-report bias.
Research indicates that the most effective approaches to reducing alcohol consumption are those which target the entire population, such as increasing the price and reducing the availability of alcohol . In Ireland, the Public Health (Alcohol) Act (2018)  has recently (October, 2018) been passed and will introduce a number of population-based strategies to reduce alcohol consumption, including a minimum unit price for alcohol sales and restrictions on advertising and marketing. This policy represents one of the most progressive alcohol policies in the world. It was fiercely contested by the alcohol industry and the interval between the publication of the Bill and the passage of the Act at 3 years was the longest ever in Ireland. None of the provisions in the Act have yet been implemented. The findings in this study demonstrate that alcohol-related harms in Ireland are distributed across the population, providing support for a population-based strategy to reducing alcohol consumption. The findings thus indicate a need for the rapid implementation of measures outlined in the Public Health (Alcohol) Act (2018).
It is important to note that factors other than those included in the study may contribute to alcohol-related harms. For example, a population-based study of drinking habits in Finland  demonstrated that after holding drinking patterns constant, drinking context was associated with different types of harms. Future research could examine the association between drinking context and alcohol-related harms in Ireland. Additionally, the harms included in the study were self-reported; in other countries, the prevention paradox has been found to be valid across more serious harms such as hospitalisations and alcohol-related deaths . Further research could explore if these findings could be replicated in the Irish context.
The majority of alcohol-related harms in Ireland occurred among drinkers who engage in heavy episodic drinking. Almost two-thirds of drinkers reported engaging in heavy episodic drinking in the last 12 months, indicating that hazardous patterns of drinking are the norm in Ireland. Given the distribution of alcohol-related harm, a population-based approach to reducing alcohol consumption such as that outlined in the Public Health (Alcohol) Act (2018) is therefore the most appropriate policy strategy to reduce alcohol-related harm in Ireland.
Availability of data and materials
The dataset used and/or analysed for the purpose of this study are available from the corresponding author on reasonable request.
Computer Assisted Personal Interview
Diagnostic and Statistical Manual of Mental Disorders, 4th Edition
Heavy episodic drinking
National Alcohol Dairy Survey
Organisation for Economic Co-operation and Development (OECD)
Standardized Measurement of Alcohol-Related Troubles
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Funding for the survey was provided by the Department of Health in Ireland. The funders had no input in the study design, collection, analyses or interpretation of the data or in writing in the manuscript.
Ethics approval and consent to participate
The survey was granted ethical approved by the Royal College of Physicians of Ireland and all participants gave written informed consent for their data to be used for research purposes.
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O’Dwyer, C., Mongan, D., Millar, S.R. et al. Drinking patterns and the distribution of alcohol-related harms in Ireland: evidence for the prevention paradox. BMC Public Health 19, 1323 (2019) doi:10.1186/s12889-019-7666-4
- Drinking patterns
- Population studies
- Prevention paradox