national epidemiological and health databases in sweden with … › ... ›...
TRANSCRIPT
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2013-11-23 Sid 1
Using Big Data to Study Development and Social Change
Concordia University, Montreal
Saturday November 23, 2013
National epidemiological and
health databases in Sweden
with special focus on
Swelogs
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2014-03-19 Sid 2
Short introduction of The
Swedish National Institute
of Public Health and
Swelogs
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19/03/2014 Page 3
1. The overarching aim of
Sweden’s national public
health policy is to create social
conditions that will ensure
good health, on equal terms
for the entire population.
2. The aim for society’s
measures against pathological
gambling is to reduce harm
from exaggerated gambling.
Government proposal prop 2007/08:110
Public Health Objectives
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Swelogs’ overarching goal
Swelogs aims at developing
evidence-based methods and strategies for prevention of
harmful gambling.
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Swelogs’ five main objectives
• Study changes in incidence and prevalence of PG.
• Describe problem gambling in relation to changes
in gambling behavior and gambling related
environmental factors.
• Identify relevant target groups for prevention.
• Examine the health-related, social and economic
consequences of problem gambling.
• Establish risk factors and protective factors of
gambling behaviours/habits.
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2014-03-19 Sid 6
Swelogs’ survey plan
Epidemiological
Track
In-depth track
Follow-up track
ID III
N~2 000
22-91 yrs
FU I
N=578
23-83 yrs
ID I
N=2 400
18-86 yrs
ID II
N~2 000
20-89 yrs
2014 2015
EP I
N=15 000
16-84 yrs
EP II
N=8 200
17-85 yrs
EP III
N=7 100
19-87 yrs
EP IV
N~7 000
21-89 yrs
2008/2009 2009/2010 2011 2012 2013
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• The sample consisted of 15 000 individuals, aged 16-
84, representative for the population
• Sample stratification based on predicted probabilities
for having gambling problems, age and gender
• Data collection:
– Telephone interviews primary method
– Questionnaires sent by post to those not reached
by telephone
Sampling and methods for data collection
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• Gambling (lifetime and past 12 months)
• Gambling problems (SOGS, PGSI, FORS) and
gambling related questions
• Computer gaming
• Health, demografics, socio-economy
+ register variables from Statistics Sweden
Questionnaire
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2014-03-19 Sid 9
Population registers
• National register over the total population (for
sampling)
• Registers over income, taxes, education,
occupation, immigration, emmigration,
household etc
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Topics covered in Swelogs
EP1 EP2 EP3 EP4
Gambling participation
X (also first time)
X X X
PG measure-ments
SOGS, PGSI, FORS
SOGS, PGSI
PGSI PGSI
Gambling related issues
X x X X
TV- and computer gaming
X x X x
Health issues X X X X
Social issues x - X x
Demographics* X x X x
19/03/2014 Page 10
*most demographics from national registers
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2014-03-19 Sid 11
Comparability with other
studies
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2014-03-19 Sid 12
Population studies covering gambling in Sweden
• SWEGS 1997/98 with follow up
• National Survey of Public Health 2004-
• SWELOGS 2008-2014
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19/03/2014 Page 13
PG instruments used in Sweden
• Prevalence study (SWEGS) 1997/98 and follow-up 2001
– DSM-IV Fisher Screen
– SOGS-R
• Treatment studies (from 2004)
– NODS
• National public health survey 2004->
– FORS
• SWELOGS 2008/09
– SOGS-R
– PGSI
– FORS
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19/03/2014 Page 14
A public health perspective on problem gambling measurement?
• We need to identify, monitor and research
persons at risk but not yet with many
problems
• We need to develop an instrument which can
– embrace a more dynamic view allowing a non-
deterministic perspective on PG as a continuum
– focus more on the context and less on the clinical
manifestation
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2014-03-19 Sid 15
Cross-sectional vs
longitudinal study;
The national health survey
vs Swelogs
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19/03/2014 Page 16
FORS: In the past 12 months, how many times have you…
1. … tried to cut down on your gambling?
2. … feel restless or irritable if you were not
able to gamble?
3. … lied about how much you gambled?
Never = 0; Once or twice = 1;
At least three times = 2
FORS sum>0 => Risk of gambling problems
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Risk of gambling problems (FORS)
2014-03-19 Sid 17
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Risk of gambling problems (FORS) 2008
2014-03-19 Sid 18
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Problem gambling (PGSI 3+), Swelogs EP1 2008/09
2014-03-19 Sid 19
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2014-03-19 Sid 20
Prevalence, incidence
and transitions
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Prevalence EP I and EP II
19/03/2014 Page 21
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Prevalence EP I and EP II
19/03/2014 Page 22
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Transitions in different PGSI categories
19/03/2014 Page 23
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2014-03-19 Sid 24
Persistent
non problem
gamblers
59.2 %
New
non problem
gamblers
10.7%
Moved out from
non problem
gambling
8.8 %
New cases -
true incidence
1.1 %
New cases -
relapsed
0.3 %
Persistent
non gamblers
17.6 %
Persistent
problems
0.6 %
Recovered from
problems
1.6 %
Non problem
gamblers: no
problems or low
risk
Problems:
Moderate risk
or gambling
problems
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19/03/2014 Page 25
Tot M F 16–24 yrs 2008
25–44 yrs 2008
45–64 yrs 2008
65–84 yrs 2008
M F M F M F M F Continued problem gamblers
26 % 32 % 13 % 41 % 11 % 21 % 6 % 32 % – 50 % 27 %
Est. number 41 700 35 900 5 800 14 900 1 200 10 000 900 7 500 <100 3 500 3 700
with gambling problems
46 % 41 % 60 % 23 % – 50 % – 67 % – 67 % Most
True incidence 1,0 % 1,0 % 1,1 % 2,9 % 1,0 % 0,5 % 0,9 % 0,1 % 1,9 % 1,6 % 0,2 %
Est. number 78 300 36 900 41 400 16 400 5 300 6 600 11 000 1 700 23 800 12 100 1 200
with gambling problems
5 % 7 % 3 % 8 % – – 11 % – – 11 % –
Relaps after EP1 (of people with previous problems)
11 % 12 % 2 % 14 % 3 % 15 % 1 % – 28 % – –
Est. number 20 500 20 200 400 6 100 300 14 100 <100 – <100 – –
with gambling problems
4 % 4 % 2 % 5 % – 4 % – Most – –
Total incidens 1,4 % 1,6 % 1,1 % 4,3 % 1,3 % 1,8 % 0,9 % 0,1 % 1,9 % 1,6 % 0,2 %
Est. number 98 800 57 000 42 000 22 500 5 700 20 700 11 000 1 700 23 800 12 100 1 200
with gambling problems
6 % 8 % 3 % 10 % – 6 % 11 % – – 11 % –
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Incidence (new PGSI 3+)
19/03/2014 Page 26
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19/03/2014 Page 27
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PGSI over EP1-3
19/03/2014 Page 28
Non-gamblers No problem Low risk
Problem
gamblers
Non-gamblers EP2 61% 75,4% 22,9% 1,2% 0,5%
No problems EP2 35% 42,7% 54,4% 2,5% 0,4%
Low risk EP2 2% 50,0% 41,2% 8,8% 0
Problem gamblers EP2 1% 45,5% 54,5% 0 0
Non-gamblers EP2 16% 51,3% 46,4% 1,7% 0,6%
No problems EP2 77% 18,0% 78,9% 2,7% 0,5%
Low risk EP2 5% 23,3% 59,5% 11,2% 6,0%
Problem gamblers EP2 2% 18,9% 59,5% 10,8% 10,8%
Non-gamblers EP2 12% 38,2% 50,0% 2,9% 8,8%
No problems EP2 55% 16,0% 73,5% 6,8% 3,7%
Low risk EP2 27% 15,2% 49,4% 29,1% 6,3%
Problem gamblers EP2 6% 10,5% 42,1% 42,1% 5,3%
Non-gamblers EP2 11% 54,5% 9,1% 27,3% 9,1%
No problems EP2 32% 18,2% 57,6% 21,2% 3,0%
Low risk EP2 31% 9,4% 53,1% 21,9% 15,6%
Problem gamblers EP2 26% 11,1% 25,9% 25,9% 37,0%
Non-
gamblers
No
problems
Low risk
Problem
gamblers
EP3
EP1 EP2
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2014-03-19 Sid 29
Time perspective
(past year/past month/
past week)
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2014-03-19 Sid 30
Detail level of
measurements concerning
gambling frequency,
spending and so on
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2014-03-19 Sid 31
The importance
of the first wave
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2014-03-19 Sid 32
Attrition
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Sampling Strategy
19/03/2014 Page 33
kp values Gender Age-groups 2008 Total
16-24 25-34 35-64 65-84
03.0kp male 307
2,757 203
89,754 742
985,291 749
432,879 2,001
1,510,681
female 347
375,622 444
516,388 512
1,789,951 697
756,867 2,000
3,438,828
1.003.0 kp male 582
342,966 632
400,130 422
801,697 364
214,761 2,000
1,759,554
female 1477
141,629 243
38,339 242
35,092 38
3625 2,000
218,685
kp1.0 male 2184
200,786 938
92,634 285
84,338 93
8,606 3,500
386,364
female 1,029
1,323 1,230
2638 1,231
2283 9
11 3,499
6,255
Total 5,926
1,065,083 3,690
1,139,883 3,434
3,698,652 1,950
1,416,749 15,000
7,320,367
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Respons rates
Wave n Respons Weighted respons
EP1 15,000 54% 63%
EP2 8,000 74% 80%
EP3 7,000 60% 62%
2014-03-19 Sid 34
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EP3 respondent; % of the initial sample per strata
2014-03-19 Sid 35
16-24 25-34 35-64 65-84 Total
pk<=0.03 male 19% 40% 44% 41% 38%
female 33% 38% 50% 33% 38%
0.03<pk<0.01 male 31% 36% 34% 33% 34%
female 34% 24% 20% 11% 31%
0.01<pk male 28% 15% 13% 17% 23%
female 17% 17% 14% 11% 16%
Total 28% 24% 29% 35% 28%
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EP3 respondents, % of EP1 respondents
2014-03-19 Sid 36
16-24 25-34 35-64 65-84 Total
pk<=0.03 male 41% 60% 67% 64% 62%
female 52% 58% 71% 60% 61%
0.03<pk<0.01 male 47% 58% 59% 64% 56%
female 49% 50% 48% 33% 49%
0.01<pk male 45% 40% 45% 57% 44%
female 39% 42% 39% 20% 40%
Total 46% 50% 57% 62% 51%
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Distribution of PGSI EP1
2014-03-19 Sid 37
P<0.001
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Or: what happend in the different categories?
2014-03-19 Sid 38
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2014-03-19 Sid 39
Pros and cons
of conducting the study
within the Swedish National
Institute of Public Health
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2014-03-19 Sid 40
Key learnings and
contributions
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My vision for a possible Swelogs 2.0
• Refined stratification of the population to
ensure a larger number of middle-aged and
elderly women
• Original sample size at least 20,000
• Allow for at least 2 pilot waves
• Web-based data collection?
• Solid team throughout the project
2014-03-19 Sid 41
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19/03/2014 Page 42