Induced abortion: Global trends, local research methods · ABORTION INCIDENCE IN 2010-2014: 56...
Transcript of Induced abortion: Global trends, local research methods · ABORTION INCIDENCE IN 2010-2014: 56...
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Induced abortion: Global trends, local research methods
Gilda Sedgh
February 2017
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© Guttmacher Institute 2016 2
WHY ESTIMATE ABORTION INCIDENCE?
To help monitor trends in abortion and unintended pregnancy
To motivate investments in prevention of unintended pregnancy and unsafe abortion
To help ensure an informed discourse on abortion
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© Guttmacher Institute 2016 3
Objectives
PRIMARY:
To calculate subregional, regional and global levels and trends in abortion incidence in 1990 to 2014
SECONDARY:
To calculate the proportion of pregnancies that end in abortion
To examine whether abortion rates vary with the legal status of abortion
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Key findings
ABORTION INCIDENCE IN 2010-2014:
56 million induced abortions occurred each year, on average
There were 35 abortions per 1,000 women aged 15-44
One in four pregnancies ended in abortion
73% of abortions were obtained by married women
The abortion rate has declined in the developed world, but not in the developing world
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Methodology
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Abortion estimation: past and present
BASIS OF PRIOR ABORTION ESTIMATES:
Available abortion data
Informal inference to countries without data
BASIS OF NEW ESTIMATES:
Available abortion data
Data on factors associated with abortion incidence
Hierarchical time series model
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Total number of abortions
with unmet need for contraception
using contraception (with failure)
with no need for contraception
Conceptual Framework Predictors of overall rates
=
+
+
Abortions among women:
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Conceptual Framework Predictors of subgroup rates
Abortions to women with unmet need
Frequency of sex
Fecundity
Strength of motivation to avoid an unplanned birth
Ability to act on fertility intentions
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1990-1994 1995-1999 2000-2004 2005-2009 2010-2014 1990-2014
World 69% 68% 67% 63% 47% 83%
Africa 1 31 10 21 41 57
Asia 75 76 80 70 45 84
LAC 69 5 19 33 3 85
N America 100 100 100 100 100 100
Europe 84 96 89 91 88 98
Oceania 79 77 75 74 12 75
Percent of women 15-44 represented by at least one observation on abortion incidence
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Findings
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About 56 million abortions took place each year in 2010-2014
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
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The global abortion rate fell slightly
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
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The abortion rate fell significantly in the developed world, but not in the developing world
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
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© Guttmacher Institute 2016 14 Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
This is reflected in the regional trends
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© Guttmacher Institute 2016 15 Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
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The percent of pregnancies ending in abortion is increasing in the developing world
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
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The abortion rate is similar in countries grouped by legal status
37 43
33 31 34
0
20
40
60
Prohibitedaltogether or to
save woman's life
Physical health Woman's mentalhealth
Socio-economicgrounds
On request
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
Abor
tions
per
1,0
00 w
omen
15-
44
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The abortion rate is higher among married women than unmarried women
36
25
33
18
37
27
0
20
40
60
World Developed countries Developing countries
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
Abor
tions
per
1,0
00 w
omen
15-
44 Married Unmarried
*
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Married women account for the majority of abortions
73
27
69
31
73
27
0
20
40
60
80
100
World Developed countries Developing countries
Sedgh et al, Induced abortion 1990 to 2014: Global, regional, and subregional trends, Lancet 2016
Perc
ent o
f abo
rtio
ns
Married Unmarried
* * *
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ADDITIONAL FINDINGS
88% of abortions were obtained in the developing world
The decline in the abortion rate in the developed world occurred mostly among married women
Prior global abortion estimates were conservatively low
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Findings in context (Discussion)
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UNMET NEED FOR CONTRACEPTION
225 million women in the developing world want to avoid getting pregnant but are not using a modern method of contraception
Women’s reasons for not using a method include:
o Concerns side effects and health risks of methods
o Thinking they can avoid pregnancy without a method
o Stigma related to not being married
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UNSAFE ABORTION: DEFINITION AND MEASUREMENT
WHO definition of unsafe abortion:
– Abortions done by untrained persons or in hygienic settings
Method for estimating unsafe abortions, 1990-2008:
– Unsafe abortions are illegal abortions
Method for estimating unsafe abortions, 2010-2014:
– Safety is related to strength of health care systems, gender equity, access to misoprostol
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OUTCOMES OF UNSAFE ABORTION
Treated complications:
– 6.9 million women in developing countries are treated for complications from unsafe abortion each year
– 1 out of every 5 abortions in the developing world leads to a treated complication
Maternal deaths:
– At least 22,000 women died from unsafe abortion in 2014
– Abortion case fatality rate: TBD
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POLICY RECOMMENDATIONS
Address barriers to contraceptive use in developing countries
o Improve the quality of family planning services
Ensure women have access to safe abortion care
o Abortion is prevalent throughout the world
Ensure access to post-abortion care
o Millions of women experience complications from unsafe abortions
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UK Government Dutch Ministry of Foreign Affairs
Norwegian Agency for Development Cooperation
UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research
Training in Human Reproduction
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Estimating abortion incidence in a country with clandestine
abortion
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Background National and subnational estimates of abortion incidence are
needed to:
– Inform policy decisions – Monitor progress towards achieving goals – Assessing the impacts of relevant policies
With the advent of medication abortion (MA), new estimation methods are needed
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Approaches A few approaches to estimating abortion incidence in
restrictive settings have been used:
– Direct estimation approaches ask women about their abortion experiences, but tend to suffer from underreporting.
– Indirect approaches use data on treatment for post-abortion care to infer the total number of abortions
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Research aims
Apply novel methods and some prevailing approaches to estimating abortion incidence in one country (Ghana)
Compare the different approaches with respect to potential sources of bias and the magnitude of these biases
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Current methods for estimating abortion incidence
Direct questioning
Abortion Incidence Complications Methodology (AICM)
Sealed envelope method
Randomized response technique
Prospective studies
The residual method
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Innovative methods for estimating abortion incidence
The List Experiment (LE)
The Best Friend Approach (BFA)
The Anonymous Third Party Reporting Method (ATPR)
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1. AICM
The AICM involves two surveys:
a nationally representative survey of health facilities – to estimate the number of induced abortion complications treated in
facilities
a survey of experts knowledgeable about abortion – to estimate, for each complication reaching a facility, how many induced
abortions occur without complications or with untreated complications
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1. AICM Strengths:
Provides estimates of abortion incidence, incidence of treated & untreated complications, providers women use, inequities in access to safe abortion and to postabortion care (PAC)
Most commonly used method in current abortion incidence studies, so useful for comparison
Limitations:
Proportion of abortions that are treated may be overestimated if women are increasingly having medication abortions without help from health professionals.
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2. Modified AICM
Survey of experts is replaced by community-based survey of women (CBS)
The proportion of all abortions that are treated in facilities is obtained from treatment rates among women’s self-reported abortions in the CBS
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2. Modified AICM
Strengths:
Potentially provides more accurate estimates of incidence of abortion, especially uncomplicated abortions
Can yield rich contextual information not available from conventional AICM, such as characteristics of women who have abortions
Limitations:
Assumes that women are not more likely to report abortions that had complications or that received treatment
Women may over-report complications from MA (but not treatment rates)
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3. List experiment
Involves reading respondents a list of four non-sensitive events, and asking them how many of these events they have experienced (in the last 3 years), but not which ones.
In half of the sample, abortion will be added as one of the items.
To increase power, we will use the “double list experiment”.
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3. List experiment
Strengths:
Protects the respondent’s confidentiality and increases likelihood of honest responses.
Can estimate subregional and subgroup abortion rates
Limitations:
May still underestimate incidence if respondents are reluctant to include abortion in their item count
Cannot obtain characteristics of women who have abortions, sources of abortion, incidence of complications
Can’t tell us when the abortion happened in the last 3 years
Doesn’t capture multiple abortions
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4. Three best friends approach
Hybrid of the ATPR and Best Friend approaches that capitalizes on the strengths of each
We will ask each respondent to think about the three women she is closest to and whether each woman has had an abortion in the past 3 years
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4. Three best friends approach
Strengths:
Asking about the respondent’s three best friends will triple the sample size relative to the best friend approach and self-reports.
We also avert the key limitation of the confidante approach
Can report multiple abortions
Limitations:
Assumes that the social networks of women who have and have not had abortions are similar.
Medical abortions might be missed. However women might tell their best friends about their abortions, even if they do not tell a health professional.
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5. Self-reports
We will ask women directly about their abortions, in their lifetime and in the past 3 years
However, we know that women underreport their abortions in surveys
Self-reports will represent the minimum standard against which to compare other approaches
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Comparing methods
Compare methodologies on their conceptual merits:
– AICM – Modified AICM
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Comparing methods
Compare methodologies on their conceptual merits:
– AICM – Modified AICM
Rank estimates from methods known to be prone to underreporting:
– Modified AICM – List Experiment – 3 Best Friend Approach – Self reporting
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Comparing methods
Ask about other sensitive behaviors for which a gold standard exists
– Example: ask women about their best friends’ contraceptive use and compare results with data from DHS or PMA
Compare components of the estimates against a gold standard:
– Example: compare incidence of treatment for miscarriage + abortion (combined) in surveys of women with estimates from surveys of facilities
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Comparing methods
Rank them on precision/power
– Direct reporting
– List Experiment
– 3 BFA
– AICM and mAICM – hardest to compute
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AICM
Modified AICM List
experiment
3 best friends
Self-reports
Questions and comments?
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Thank you
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Calculating abortion incidence
X _____ AICM/ modified AICM: # abortion complications seen in facilities
Proportion of all abortions with treated complications (AICM: from survey of experts)
(Modified AICM: from survey of women)
___________________________________________ 1000
Women 15-49
List experiment a: (mean # events reported by treatment gp) – (mean # events reported by control gp)
Number of women in CBS *3 __________________________________________________________________ X 1000
Number of best friends * 3 _______________________________________________ 1000 X # abortions reported by best friends in past 3 years 3BF a:
a: annualized over 3 years
# abortions reported by women in past 3 years # women in CBS* 3
X 1000 __________________________________________ Self-reports a:
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Comparing and validating estimates APPROACH Potential bias and
strength of bias (*) Potential impact of MA
Subgroup estimates
Measures Reference period
AICM May underestimate % of abortions with no complications ***
Increase bias, underestimate incidence
Region Incidence; ratio; complication rate; treatment rate
1 year Modified AICM
May underestimate % of abortions with no complications **
No impact (effects cancel out)
List experiment
** May under-report abortions (but not over-report) ****
Unclear
Region; urban/rural; age group
Incidence 3 years
Self-reports Incidence; complication rate; treatment rate
3 years Lifetime
3 best friends
May not capture uncomplicated abortions OR may overestimate % of friends who had abortion *
May underestimate incidence if MA less visible
Region; urban/rural
Incidence; complication rate; treatment rate
1 year 3 years Lifetime