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REVISTA PAN AMERICANPANAMERICANA JOURNAL OFDE SALUD PÚBLICA PUBLIC HEAL TH
Supplementary material to: Shield KD, Monteiro M, Roerecke M, Smith B,Rehm J. Alcohol consumption and burden ofdisease in the Americas in 2012: implications foralcohol policy. Rev Panam Salud Publica.2015;38(6):442-9.
This material formed part of the original submission and has been peer reviewed.We post it as supplied by the authors.
Material suplement ario / Supplement ary material / Material supplement ar
Web Appendix. Inf ormation on alcohol consumption data, and methods used to calculate the
Methods
Alcohol exposure estimates
Total, recorded, unrecorded and tourist adult per capita consumption (in litres of pure alcohol)
were obtained by country from 1961 to 2012 (beverage specific data on recorded alcohol
consumption was available from 1961 to 2010). Recorded consumption is alcohol that is tracked
by governments through production, sales and taxation statistics, market research firms serving
the alcoholic beverage industry, and the United Nations Food and Agriculture Organization.
Unrecorded consumption is alcohol that is not tracked through the statistics of recorded
consumption, and can originate from a variety of sources, including, for example, surrogate
alcohol (alcohol not officially intended for consumption) (see (1) for the sources of unrecorded
alcohol consumption). Data for unrecorded alcohol consumption are usually obtained from a
variety of sources, including government-monitoring data, surveys and expert judgments (2).
Tourist per capita consumption of alcohol represents both cross-border trade and the amount of
alcohol consumed by foreign tourists (accounting for the amount of alcohol consumed by the
countries’ inhabitants when they travel outside their own country). Data on tourist consumption is
estimated using tourist visa data and data from special sales taxes or measures of alcoholic
beverages sold to tourists (if implemented in a country).
Prevalence of both current abstainers (made up of both lifetime abstainers (people who have
never consumed a standard drink of alcohol) and former drinkers (people who have consumed a
standard drink of alcohol but have not done so in the past year) and of current drinkers (those who
have consumed alcohol in the past year) were obtained by triangulating survey data with data
obtained from a regression analysis of all published survey data found through a systematic
review (3).
SUPPLEMENTARY MATERIAL Shield et al. • Alcohol consumption and burden of disease in the Americas
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alcohol - population- attributable f ractions
The pattern of alcohol consumption was measured through the prevalence of heavy episodic
drinking and the pattern of drinking (POD) scores. The POD scores capture six different aspects
of drinking: (i) the usual quantity of alcohol consumed per drinking occasion; (ii) the prevalence
and frequency of festive drinking; (iii) the proportion of drinking events when drinkers become
intoxicated; (iv) the proportion of drinkers who drink daily or nearly every day; (v) the frequency
of drinking with meals and outside of meals; and (vi) the prevalence of drinking in public places.
Data on these variables were collected through a key informant survey, with the POD scores
being validated from previous pattern of drinking scores measured at the global level (3).
Specifically, the data from the key informant survey are aggregated and scaled from 1 to 5 (1
representing the least risky drinking pattern and 5 representing the most risky drinking pattern)
and missing information is then imputed by expert opinion.
Alcohol consumption among current drinkers was modelled by triangulating total adult per capita
consumption data with survey data to correct for the inconsistent and severe undercoverage of
population alcohol consumption when measured by population alcohol surveys (as compared to a
more accurate source of adult per capita consumption data). The distribution of alcohol
consumption was modelled using a Gamma distribution, which Rehm and colleagues and Kehoe
and colleagues found best describes the population distribution of alcohol consumption (4, 5). To
describe the distribution of alcohol consumption by age and sex, the relative alcohol consumption
amounts by age and sex (as obtained from population surveys (3)) were combined with
population data and per capita consumption of alcohol data to estimate the mean alcohol
consumption by age and sex. The standard deviation of the alcohol consumption distribution was
modelled according to Rehm and colleagues, who observed that the standard deviation of a
population alcohol consumption distribution could be predicted using the mean of the alcohol
consumption distribution (4).
Shield et al. • Alcohol consumption and burden of disease in the Americas SUPPLEMENTARY MATERIAL
38(6), 2015Rev Panam Salud Publica 3
Alcohol-attributable burden calculations for 2012
For diseases and injuries where alcohol is a component cause (i.e. alcohol increases the risk for
the disease or injury, but is not a necessary cause), the alcohol population-attributable fraction
(PAF) combines information on the prevalence of current drinkers, former drinkers and lifetime
abstainers, the distribution of alcohol consumption among current drinkers, and the relative risk
(RR) for a disease for current drinkers and former drinkers as compared to lifetime abstainers. For
most diseases casually related to alcohol, the alcohol PAF is estimated using the formula:
(Formula 1)
𝑃𝐴𝐹!
=𝑃!"#$%"&$_!"#$!%&'(# + 𝑃!"#$%#_!"#$%&"'𝑅𝑅!_!"#$%# !"#$%&"' 𝑃 𝑥 !"##$%& !"#$%&"'𝑅𝑅!(𝑥)!"##$!"_!"#$%&"'𝑑𝑥 − 1
!"#!!
𝑃!"#$%"&$_!"#$!%&'(# + 𝑃!"#$%#_!"#$%&"'𝑅𝑅!_!"#$%# !"#$%&"' 𝑃 𝑥 !"##$%& !"#$%&"'𝑅𝑅!(𝑥)!"##$%&_!"#$%&"'𝑑𝑥!"#!!
where Plifetime_abstainers, Pformer_drinkers and Pcurrent_drinkers represent the prevalence of lifetime abstainers,
former drinkers and current drinkers respectively, x represents the average daily alcohol
consumption in grams of pure alcohol per day, and RRi_former drinkers and RRi(x)current_drinkers represent
the RR for disease i for former drinkers and current drinkers respectively. For a list of the
diseases for which alcohol PAFs were modelled, and for the sources of the RR functions, see
Table A1.
Table A1. Sources of Relative Risk functions by ICD-10 Code.*
Conditions ICD 10 Code New WHO code Old WHO code Sources for Relative Risks
Infectious and parasitic diseases
Tuberculosis A15-A19 3 IA1 (6); for causal relationship see: (7)
Human immunodeficiency virus/ Acquired immune deficiency syndrome
B20-B24 10 IA3
(8)
Malignant neoplasms 61 IIA
Mouth and oropharynx cancers C00-C14 62 IIA1 (9, 10) (based on Relative Risks from (11))
Esophageal cancer C15 63 IIA2
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Table A1. Sources of Relative Risk functions by ICD-10 Code.*
Conditions ICD 10 Code New WHO code Old WHO code Sources for Relative Risks
Liver cancer C22 66 IIA5
Laryngeal cancer C32 78 Breast cancer C50 70 IIA9
Colon cancer C18 65 IIA4
Rectal cancer C20 Diabetes Diabetes mellitus E10-E14 80 IIC (12) Neuro-psychiatric conditions
Alcoholic psychoses (part of AUD)
F10.0, F10.3-F10.9
86 IIE4
100% AAF per definition
Alcohol abuse (part of AUD) F10.1 100% AAF per definition
Alcohol dependence (part of AUD) F10.2 100% AAF per definition
Epilepsy G40-G41 97 IIF3 (13) Cardiovascular disease 110 IIH
Hypertensive disease I10-I15 112 IIH2 (14)
Ischemic heart disease I20-I25 113 IIH3 (15) for volume, (16) for pattern
Cardiac arrhythmias I47-I49 116 IIH6 (17)
Ischemic stroke I60-I62 114 IIH4 (18)
Hemorrhagic and other non-ischemic stroke I63-I66 114 IIH4 (18)
Digestive diseases 121 IIJ
Cirrhosis of the liver K70, K74 123 IIJ2 (19)
Acute and chronic pancreatitis K85, K86.1 125 (20)
Respiratory infections
Pneumonia J10.0, J11.0, J12-J15, J18 39 IB1 (21)
Conditions arising during the prenatal period
Low birth weight: as defined by the global burden of disease P05-P07 50 ID1 (22)
Unintentional injuries 152 IIIA
Motor vehicle accidents § 153 IIIA1 (23) for Relative Risk, methodology adopted from (24) Poisonings X40-X49 154 IIIA2
Falls W00-W19 155 IIIA3
Shield et al. • Alcohol consumption and burden of disease in the Americas SUPPLEMENTARY MATERIAL
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Table A1. Sources of Relative Risk functions by ICD-10 Code.*
Conditions ICD 10 Code New WHO code Old WHO code Sources for Relative Risks
Fires X00-X09 156 IIIA4
Drowning W65-W74 157 IIIA5
Other Unintentional injuries
†Rest of V-series and W20-
W64, W 75-W99, X10-X39, X50-X59, Y40-Y86, Y88, and
Y89
159 IIIA7
Intentional injuries 160 IIIB
Self-inflicted injuries X60-X84 and Y87.0 161 IIIB1 (23) for Relative Risk,
methodology adopted from (24)
Homicide X85-Y09, Y87.1 162 IIIB2
§ V021–V029, V031–V039, V041–V049, V092, V093, V123–V129, V133–V139, V143–V149, V194–V196, V203–V209, V213–V219, V223–V229, V233–V239, V243–V249,V253–V259, V263–V269, V273– V279, V283–V289, V294–V299, V304–V309, V314–V319, V324–V329, V334–V339, V344–V349, V354–V359, V364–V369, V374–V379, V384–V389, V394–V399, V404–V409, V414–V419, V424–V429, V434–V439, V444–V449, V454–V459, V464– V469, V474–V479, V484–V489, V494–V499, V504–V509, V514–V519, V524–V529, V534–V539, V544–V549, V554–V559, V564–V569, V574–V579, V584–V589, V594–V599, V604–V609, V614–V619, V624–V629, V634–V639, V644–V649, V654– V659, V664–V669, V674–V679, V684–V689, V694–V699, V704–V709, V714–V719, V724–V729, V734–V739, V744–V749, V754–V759, V764–V769, V774–V779, V784–V789, V794–V799, V803–V805, V811, V821, V830–V833, V840–V843, V850– V853, V860–V863, V870–V878, V892. †Rest of V = V-series MINUS §. *For Russia and similar countries, Russia-specific RR functions were used (see (3) for RR function descriptions).
Low birth weight attributable to alcohol consumption
To estimate the mortality and morbidity due to low birth weight attributable to alcohol
consumption, we modelled the alcohol consumption of pregnant women who drank the
same amount of alcohol as pre-pregnancy and the alcohol consumption of pregnant
women who drank less (see (3) for data sources). The alcohol PAFs for low birth weight
were calculated as follows:
𝑃𝐴𝐹 =𝑃!"#$!%&'( + 𝑃!"## 𝑥 𝑅𝑅 𝑥 𝑑𝑥 + 𝑃!"#$ 𝑥 𝑅𝑅 𝑥 𝑑𝑥!"#
!! − 1!"#!!
𝑃!"#$!%&'( + 𝑃!"## 𝑥 𝑅𝑅 𝑥 𝑑𝑥 + 𝑃!"#$ 𝑥 𝑅𝑅 𝑥 𝑑𝑥!"#!!
!"#!!
SUPPLEMENTARY MATERIAL Shield et al. • Alcohol consumption and burden of disease in the Americas
Rev Panam Salud Publica 38(6), 2015 66
where Pabstainer is the prevalence of women who abstained from consuming alcohol while
pregnant, Psame represents the prevalence of pregnant women who consumed the same
amount of alcohol as pre-pregnancy, and Pless represents the prevalence of pregnant
women who consumed less alcohol than they did pre-pregnancy. RR represents the
relative risk for low birth weight given an alcohol consumption amount of (x).
HIV/AIDS deaths attributable to alcohol consumption
HIV/AIDS mortality attributable to alcohol consumption was calculated using
methodology outlined by Gmel and colleagues (8). This method estimates the HIV/AIDS
mortality as a result of non-adherence to medication due to alcohol consumption by combining
HIV/AIDS mortality data, the prevalence of people who require Highly Active Anti-Retroviral
Treatment (HAART) and who are also receiving this treatment (obtained from the 2006 Report
on the Global AIDS Epidemic (25)), the mortality rate among those individuals who receive
HAART and those who do not (26), the rate of deaths for those who adhere to HAART and for
those who do not (27), and the hazard of not adhering to HAART if you are a current drinker as
compared to a lifetime abstainer (28).
Ischemic heart disease attributable to alcohol consumption
The risk of ischemic heart disease mortality and morbidity is impacted by average volume of
alcohol consumption and the patterns of drinking. Thus, data on average alcohol consumption and
binge alcohol consumption were used to estimate the alcohol PAF for ischemic heart disease
mortality and morbidity attributable to alcohol consumption (29, 30). For modelling the mortality
and morbidity from ischemic heart disease that was attributable to alcohol consumption, we used
an age dependent RR function ((15); see also (31) or (32) for similar results) for all individuals
who did not engage in episodic or chronic heavy drinking. For people with at least one heavy
Shield et al. • Alcohol consumption and burden of disease in the Americas SUPPLEMENTARY MATERIAL
38(6), 2015Rev Panam Salud Publica 7
episodic drinking occasion (defined as drinking occasions where men consume 5 standard drinks
or more (the equivalent of consuming 60 grams of pure alcohol or more during one drinking
occasion) and where women consume 4 standard drinks or more (the equivalent of consuming 48
grams of pure alcohol or more during one drinking occasion)) per month, we assumed there was
no cardio-protective effect (16) and, thus, these people were assigned a relative risk of 1.
Injuries attributable to alcohol consumption
The morbidity from injuries attributable to alcohol consumption was estimated according to
methodology outlined by Shield and colleagues (33). This calculation method uses data on
alcohol consumption during both normal drinking days and during binge drinking days. For
modelling the number of injuries attributable to alcohol consumption, we used data on the
prevalence of current drinkers, the prevalence of binge drinkers, and the frequency of binge
drinking. The risk relationship between alcohol consumption and injuries was obtained from the
meta-analysis performed by Taylor and colleagues (23) and from metabolism data (24)
(metabolism data were used to calculate the period of time during a drinking occasion when a
person was at risk for an injury).
The alcohol PAFs for intentional and unintentional injuries attributable to alcohol consumption
were calculated as follows:
𝑃𝐴𝐹 =𝑃!"#$!%&'(# + 𝑃!"##$%&(!"!!!"#$%)𝑅𝑅!"##$%&(!"!!!"#$%) + 𝑃!"##$%&(!"#$%)𝑅𝑅!!""#$%(!"#$%) − 1𝑃!"#$!%&'(# + 𝑃!"##$%&(!"!!!"#$%)𝑅𝑅!"##$%&(!"!!!"#$%) + 𝑃!"##$%&(!"#$%)𝑅𝑅!"##$%&(!"#$%)
where Pabstainer represents the prevalence of current abstainers, and Pcurrent(binge) and Pcurrent(non-binge)
are the prevalence of current drinkers who engage in binge drinking and the prevalence of current
drinkers who do not engage in binge drinking, respectively. The RRs for current drinkers who
engage in binge drinking and for current drinkers who do not engage in binge drinking were
calculated separately as follows:
SUPPLEMENTARY MATERIAL Shield et al. • Alcohol consumption and burden of disease in the Americas
8 38(6), 2015 Rev Panam Salud Publica
𝑅𝑅!"##$%& !"!!!"#$% = 𝑅𝑅!"#$!%# 𝑥!"#$!%#!!"!!!"#$% − 1 ∗ 𝑃!"!!!"#$!!"#$ + 1
and
𝑅𝑅!"##$%&(!"#$%) = 𝑅𝑅!"#$!%#(𝑥!"#$!%#!!"!!!"#$%) − 1 ∗ 𝑃!"!!!"#$%_!"#$ + 𝑅𝑅!"#$%(𝑥!"#$%) − 1
∗ 𝑃!"#$%_!"#$
where
𝑅𝑅!"#$!%# 𝑥!"#$!%#!!"!!!"#$% = 𝑃!"#"$%&'( 𝑥!"#$!%#!!"!!!"#$% ∗ 𝑅𝑅!"#$%& 𝑥!"#$!%#!!"!!!"#$% − 1 + 1
and
𝑅𝑅!"#$% 𝑥!"#$% = 𝑃!"#"$%&'( 𝑥!"#$% ∗ 𝑅𝑅!"#$%!& 𝑥!"#$% − 1 + 1
In the above formulae, Pdayatrisk represents the proportion of a day at risk, and RRinjury is the
relative risk for injury given an amount of alcohol consumed (xbinge alcohol consumption during
heavy episodic drinking occasions and xaverage-non-binge alcohol consumption during average non-
heavy episodic drinking days). Pdayatrisk is calculated based on the average rate at which alcohol is
metabolized, thereby corresponding to the time during which the blood alcohol level is
sufficiently elevated to increase the risk of injury. Pbinge_days and Pnon-binge_days represent the
proportion of heavy episodic drinking days and non-binge drinking days among binge drinkers
respectively.
The above-presented alcohol PAFs were determined based on injury RR estimates that were
calculated using samples of emergency room patients. In the case of injury mortality alcohol
PAFs, the alcohol PAF for morbidity from non-motor vehicle accidents was multiplied by 9/4 and
the alcohol PAF for morbidity from motor vehicle accidents was multiplied by 3/2. These
multiplication factors were based on two studies that compared blood alcohol levels of
emergency room patients with blood alcohol levels obtained from coroners’ reports of patients
who died from an injury (34, 35).
Shield et al. • Alcohol consumption and burden of disease in the Americas SUPPLEMENTARY MATERIAL
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For women, the alcohol PAF for motor vehicle accidents was calculated by multiplying the
alcohol PAF for motor vehicle accidents for men by the product of the per capita consumption of
alcohol for women divided by the per capita consumption of alcohol for men. This imputation
method was performed since the RR function for motor vehicle accidents is considered valid for
men only (36).
Regions
Table A2. World Health Organization (WHO) sub-regional classification of countries in the Americas according to childhood and adult mortality WHO sub-region* Countries A (Very low childhood and very low adult mortality rates) Canada, Cuba, United States of America
B (Low childhood and low adult mortality rates)
Antigua and Barbuda, Argentina, Bahamas, Barbados, Belize, Brazil, Chile, Colombia, Costa Rica, Dominica, Dominican Republic, El Salvador, Grenada, Guyana, Honduras, Jamaica, Mexico, Panama, Paraguay, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Suriname, Trinidad and Tobago, Uruguay, Venezuela (Bolivarian Republic of)
D (High childhood and high adult mortality)
Bolivia (Plurinational State of), Ecuador Guatemala, Haiti, Nicaragua, Peru
* Regional subgroups defined by the World Health Organization (37) based on the rates of childhood and adult mortality
SUPPLEMENTARY MATERIAL Shield et al. • Alcohol consumption and burden of disease in the Americas
Rev Panam Salud Publica 38(6), 2015 10
Results
Figure A1. Recorded adult per capita consumption of alcohol (litres of pure alcohol) in the Americas for sub-regions A, B, and D from 1961 to 2010
Figure A2. Alcohol-attributable DALYs lost per 1,000 people for (A) women and (B) men in the Americas in 2012
0"
2"
4"
6"
8"
10"
12"
1960" 1965" 1970" 1975" 1980" 1985" 1990" 1995" 2000" 2005" 2010"
Adult&p
er&cap
ita&con
sump1
on&of&recorde
d&alcoho
l&&(litres&of&p
ure&alcoho
l)&
Year&
Americas"3"sub3region"A" Americas"3"sub3region"B" Americas"3"sub3region"D" Americas" World"
0 3 6 10 20 30 40 600 3 6 10 20 30 40 60
0 3 6 10 20 30 40 60
A" B"
Alcohol(a*ributable"DALYs"per"1000"people""
Shield et al. • Alcohol consumption and burden of disease in the Americas SUPPLEMENTARY MATERIAL
38(6), 2015Rev Panam Salud Publica 11
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