Increasing HIV testing among pregnant women in Ontario: Results from the HIV seroprevalence study to...
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Increasing HIV testing among pregnant women Increasing HIV testing among pregnant women in Ontario: Results from the HIV in Ontario: Results from the HIV seroprevalence study to September 2002seroprevalence study to September 2002
Robert S. Remis, Robert S. Remis, Carol SwanteeCarol Swantee, Carol Major, Margaret Fearon, , Carol Major, Margaret Fearon, Evelyn Wallace, Robert WH Palmer, Peggy Millson, Liviana Evelyn Wallace, Robert WH Palmer, Peggy Millson, Liviana Calzavara, Elizabeth Rea, Susan King, Keyi Wu, Marion Vermeulen, Calzavara, Elizabeth Rea, Susan King, Keyi Wu, Marion Vermeulen, and Elaine Whittinghamand Elaine Whittingham
Department of Public Health Sciences, University of Toronto;Department of Public Health Sciences, University of Toronto;
Laboratories Branch and Public Health Branch, Laboratories Branch and Public Health Branch, Ontario Ministry of Health and Long Term-Care;Ontario Ministry of Health and Long Term-Care;
Toronto Public Health; Hospital for Sick ChildrenToronto Public Health; Hospital for Sick Children
12th Annual Canadian Conference on HIV/AIDS Research 12th Annual Canadian Conference on HIV/AIDS Research
Halifax, Nova Scotia, April 10-13, 2003Halifax, Nova Scotia, April 10-13, 2003
AcknowledgmentsAcknowledgments
• Central Public Health Laboratory, Central Public Health Laboratory, Ontario Ministry of Health and Long-Term CareOntario Ministry of Health and Long-Term Care
• Keyi Wu, programmingKeyi Wu, programming• Mark Fisher, systems consulting and custom downloadMark Fisher, systems consulting and custom download• Prenatal Screening Evaluation Committee Prenatal Screening Evaluation Committee • Frank McGee, co-ordinatorFrank McGee, co-ordinator• Janis Tripp, consultantJanis Tripp, consultant
• FundingFunding• AIDS Bureau, Ontario Ministry of Health and Long-Term CareAIDS Bureau, Ontario Ministry of Health and Long-Term Care• Bureau of HIV/AIDS, STD and TB, Health CanadaBureau of HIV/AIDS, STD and TB, Health Canada
BackgroundBackground
• 1989-91: Ontario HIV seroprevalence study 1989-91: Ontario HIV seroprevalence study
(Coates et al), 0.23 / 1,000 (Coates et al), 0.23 / 1,000 • February 1994: ACTG 076 found ZDV reduced February 1994: ACTG 076 found ZDV reduced
mother-infant HIV transmission by 67%mother-infant HIV transmission by 67%• 1997: Modelled HIV prevalence, 0.70/1,0001997: Modelled HIV prevalence, 0.70/1,000 and and estimated estimated
uptake of prenatal HIV testing 1994-96, 20–25%uptake of prenatal HIV testing 1994-96, 20–25%
Ontario HIV screening programOntario HIV screening program
• Spring 1995: Advisory to physicians to consider HIV testing Spring 1995: Advisory to physicians to consider HIV testing of pregnant women at increased HIV riskof pregnant women at increased HIV risk
• August 1997: Committee formed to plan programAugust 1997: Committee formed to plan program• December 1998: Minister announced program to offer HIV December 1998: Minister announced program to offer HIV
testing to all pregnant womentesting to all pregnant women• January 1999: Promotional materials and requisitions sent to January 1999: Promotional materials and requisitions sent to
physiciansphysicians• September 2001: Memo included with prenatal test report to September 2001: Memo included with prenatal test report to
physicians who had not prescribed an HIV testphysicians who had not prescribed an HIV test
Study objectives Study objectives
• Quantify and characterize HIV prevalence amongQuantify and characterize HIV prevalence among women of childbearing age in Ontariowomen of childbearing age in Ontario
• Evaluate the Ontario universal HIV screening programEvaluate the Ontario universal HIV screening program
Data managementData management
• Data extracted from LAByrinth Data extracted from LAByrinth (prenatal and HIV diagnostic databases)(prenatal and HIV diagnostic databases)
• Study period: January 3, 1999 to September 30, 2002Study period: January 3, 1999 to September 30, 2002• Records from HIV prenatal database matched to records in Records from HIV prenatal database matched to records in
HIV diagnostic databaseHIV diagnostic database• Matching allowed for different spelling and structure of Matching allowed for different spelling and structure of
name (“double-barrelled” first and last names) and reversal name (“double-barrelled” first and last names) and reversal
of month/day in birth dateof month/day in birth date• Separate prenatal tests aggregated into episode equivalent to the Separate prenatal tests aggregated into episode equivalent to the
gestation period; HIV uptake analysed for each pregnancygestation period; HIV uptake analysed for each pregnancy
Data analysisData analysis
• Number of women tested at prenatal visit included:Number of women tested at prenatal visit included:• Women for whom HIV test ordered on prenatal requisition, Women for whom HIV test ordered on prenatal requisition,
or tested though HIV diagnostic serviceor tested though HIV diagnostic service• Tests categorized as current or previous to pregnancy Tests categorized as current or previous to pregnancy
• Analysis in SAS of:Analysis in SAS of:• Trends over time in proportion tested Trends over time in proportion tested • Testing rates by health region and age groupTesting rates by health region and age group• HIV-positive women: number and rates by type of test, HIV-positive women: number and rates by type of test,
region and quarterregion and quarter
Number of pregnancies by health regionNumber of pregnancies by health regionJanuary 1999 to September 2002January 1999 to September 2002
Number pregnancies Proportion
TorontoCentral East, otherSouthwestCentral WestOttawaEastern, otherNorthernN/A or OFP
140,642 117,209
68,859 82,765
40,818 43,192 34,0292,186
27%22%13%16%
8%8%6%
Total 529,700 100%
HIV testing among pregnancies by timing HIV testing among pregnancies by timing of HIV test, Ontarioof HIV test, Ontario
0
10
20
30
40
50
60
70
80
90
100
19
99
-Q1
19
99
-Q2
19
99
-Q3
19
99
-Q4
20
00
-Q1
20
00
-Q2
20
00
-Q3
20
00
-Q4
20
01
-Q1
20
01
-Q2
20
01
-Q3
20
01
-Q4
20
02
-Q1
20
02
-Q2
20
02
-Q3
Quarter (1999-2002)
Current
Previous
Any test
Pro
port
ion
of
pre
gn
an
cie
s (
%)
HIV testing among pregnancies forHIV testing among pregnancies forselected health regionsselected health regions
0
10
20
30
40
50
60
70
80
90
100Q
1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Quarter (1999-2002)
Pro
port
ion
of
pre
gn
an
cie
s (
%)
Metro TorontoCentral East, otherSouthwestCentral West
HIV testing among pregnancies forHIV testing among pregnancies forselected health regionsselected health regions
0
10
20
30
40
50
60
70
80
90
100
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Q3
Q4
Q1
Q2
Quarter (1999-2002)
Pro
port
ion o
f sp
eci
mens
(%)
Ottawa Eastern, Other Northern
Proportion of pregnancoes tested for Proportion of pregnancoes tested for HIV by health region, Quarter 3, 2002HIV by health region, Quarter 3, 2002
79%31,583 40,206 Total
78%77%80%76%84%80%80%78%
8,5417,084 3,8524,8942,6972,4681,954
113
10,981 9,124 4,824 6,408 3,2253,066
2,433 145
TorontoCentral East, otherSouthwestCentral WestOttawaEastern, otherNorthernN/A or OFP
Proportion tested
HIVtested
Number of preg’s
Number of PHUs in each region by proportion Number of PHUs in each region by proportion tested for HIV, Quarter 3, 2002tested for HIV, Quarter 3, 2002
1
50-59% 90-100%80-89%70-79%60-69%
371151830Total
85Northern
53Eastern, other
1Ottawa
725Central West
91332Southwest
615Central East, other
1Toronto
Total PHUsNumber of PHUs by proportion of HIV testing uptake
1
21
2
Number of HIV-positive pregnanciesNumber of HIV-positive pregnancies
Previous
HIV+
2
6
17
6
31
Current
HIV+
11
21
32
24
88
Total
HIV+
13
27
49
30
119
1999
2000
2001
2002
TOTAL
HIV-positive pregnancies HIV-positive pregnancies by time of diagnosis and quarterby time of diagnosis and quarter
-1
1
3
5
7
9
11
13
15
Q11999
Q31999
Q12000
Q32000
Q12001
Q32001
Q12002
By Quarter
Nu
mb
er
of
pre
gn
an
cie
s
CurrentPrevious
InterpretationInterpretation
• Actual uptake of HIV testing is somewhat higher due to false Actual uptake of HIV testing is somewhat higher due to false non-matches (especially in anonymous and coded HIV testing) non-matches (especially in anonymous and coded HIV testing)
• Study does not indicate Study does not indicate whywhy HIV tests is not carried out HIV tests is not carried out• Study does not indicate number of HIV-infected women Study does not indicate number of HIV-infected women
undiagnosedundiagnosed• Unlinked component of HIV seroprevalence study among Unlinked component of HIV seroprevalence study among
women not HIV tested in 2002 is under waywomen not HIV tested in 2002 is under way
Conclusions 1Conclusions 1
• Critical to capture data from HIV diagnostic database as well as Critical to capture data from HIV diagnostic database as well as from prenatal database from prenatal database
• HIV testing increased from 40% to 50% from January to May HIV testing increased from 40% to 50% from January to May 1999, with modest increase until September, 20011999, with modest increase until September, 2001
• Impact of memo: from 60 to 76%! Impact of memo: from 60 to 76%! • Important regional differences in HIV test uptakeImportant regional differences in HIV test uptake• Over 3.5 years, 119 women identified as HIV-positive, 41 Over 3.5 years, 119 women identified as HIV-positive, 41
previously diagnosed, 88 newly diagnosedpreviously diagnosed, 88 newly diagnosed• Data suggests more high risk pregnant women are being offered Data suggests more high risk pregnant women are being offered
and accepting HIV testingand accepting HIV testing
Conclusions 2Conclusions 2• According to model (not presented)According to model (not presented)
• Birth rate among diagnosed HIV-infected women is lowBirth rate among diagnosed HIV-infected women is low• ~20% of HIV-infected women undiagnosed at conception ~20% of HIV-infected women undiagnosed at conception
remain undiagnosedremain undiagnosed• An estimated 5-10 preventable mother-infant HIV An estimated 5-10 preventable mother-infant HIV
transmissions occurred in 2002transmissions occurred in 2002