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Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004.

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Presentation on theme: "Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004."— Presentation transcript:

1 Division of HIV/STD Using GIS to Enhance STD Surveillance 2004 National STD Prevention Conference March 10, 2004

2 Division of HIV/STD G eographic I nformation S ystems (GIS) For STDs: Geocoding Address correction Morbidity assignment Mapping Routine Surveillance Trend analysis Case visualization Rapid response/Outbreaks Spatial analysis / research applications

3 Division of HIV/STD Practical Tools Centrus GeoStan ArcView StreetMap MapPoint GeoCoder MapInfo MapMarker ArcView ArcMap StreetMap ArcPublisher MapInfo Maptitude Geocoding Mapping PC Specifications: 40GB HD, 1024MB RAM, 3.2GHz Processor, monitor resolution, video card

4 Division of HIV/STD Geocoding matching an address to latitudinal & longitudinal coordinates Example: Address: 920 W Grace St Richmond, VA Latitude: Longitude: Input addresses are matched against a postal or geocoding database

5 Division of HIV/STD Input File saved as a text file from Excel NameStreetCityCountyStZip A Movable Feast1318 E Cary StRichmondRichmond CityVA23219 Azalea Food Market & Deli211 Azalea Ave.RichmondRichmond CityVA23227 Blimpie13969 Raised AnterMidlothianRichmond CityVA23112 Bogey's Bagels13520 Midlothian TrnpkMidlothianRichmond CityVA23113 Boychiks Deli4024-B Cox RdRichmondRichmond CityVA23233 Café Rolling Hill DrRichmondRichmond CityVA23229 Carla's Kitchen920 W Grace StRichmondRichmond CityVA23220

6 Division of HIV/STD

7 NameStreetCityCountyStZip A Movable Feast1318 E Cary StRichmondRichmond CityVA23219 Azalea Food Market & Deli211 Azalea Ave.RichmondRichmond CityVA23227 Blimpie13969 Raised AnterMidlothianRichmond CityVA23112 Bogey's Bagels13520 Midlothian TrnpkMidlothianRichmond CityVA23113 Boychiks Deli4024-B Cox RdRichmondRichmond CityVA23233 Café Rolling Hill DrRichmondRichmond CityVA23229 Carla's Kitchen920 W Grace StRichmondRichmond CityVA23220 Street_newCity_newStZip_newLongitudeLatitudeCensus BlockFIPSCounty_newCode 1318 E CARY STRICHMONDVA RICHMOND CITYS80 AS0 211 AZALEA AVERICHMONDVA HENRICOS80 AS RAISED ANTLER CIRMIDLOTHIANVA CHESTERFIELDS80 AS MIDLOTHIAN TPKEMIDLOTHIANVA CHESTERFIELDS80 AS B COX RDRICHMONDVA HENRICOE022ZC5X 1602 ROLLING HILLS DRRICHMONDVA HENRICOS80 AS0 920 W GRACE STRICHMONDVA RICHMOND CITYS80 AS0

8 Division of HIV/STD Mapping Geocoded Addresses Save the geocoded data as a.dbf file Save the geocoded data as a.dbf file Create a new map file in mapping software Create a new map file in mapping software

9 Division of HIV/STD

10 Correcting Morbidity Assignments

11 Division of HIV/STD Virginia Morbidity Corrections CY2002 2,404 total cases reassigned (46.2/wk) Richmond: -703 Henrico County: +510 Chesterfield County: +220 CY2003 2,547 total cases reassigned (50.9/wk) Richmond: -749 Henrico County: +528 Chesterfield County: +220

12 Division of HIV/STD Richmond National Ranking (Rates per 100,000) GONORRHEA - Richmond YEARRANKRATE*# OF CASES CHLAMYDIA – Richmond YEARRANKRATE*# OF CASES 1992NOT AVAILABLE 1993NOT AVAILABLE 1994NOT AVAILABLE 1995NOT AVAILABLE 1996NOT AVAILABLE

13 Division of HIV/STD Gonorrhea cases and incidence rate per 100,000 for Washington State 1993 through 2002.

14 Division of HIV/STD

15 Strategic Surveillance Monitoring

16 Division of HIV/STD Benefits Standardizes surveillance monitoring: “What is normal for a given week?” Uses data from 5 yrs. vs. 1 yr. Frequency distributions Easy-to-read map Adjusts according to disease Limitations Computations more complex Higher sensitivity (too many targets?) Not an outbreak detection method Highlights

17 Division of HIV/STD What is Normal for Week 2 of 2004? Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk 4 2 Step 2: Historical Average of Week 2 = ( )/6 = 7.6 Step 1: Apply 3-week averaging window Wk 1 10 Wk 2 6 Wk 3 5 Wk 4 7 Wk5-52Wk 1 12 Wk 2 9 Wk 3 4 Wk 4 2 Repeat (Week 3): Historical Average of Week 3 = ( )/6 = 5.5

18 Division of HIV/STD Average (Week 2) = %99% Wk 2 (2003) = 10 cases = No Targeting

19 Division of HIV/STD Oct. 19thOct. 13thOct. 5th 99% + 5 week averaging window A = 5A = 7 A = 6A = 10A = 12 99% + 3 week averaging window

20 Division of HIV/STD Confidentiality “a picture’s worth a thousand words” GIS is fairly new to STD surveillance Technology has outpaced confidentiality standards Is geocoded and/or mapped data easily identifiable? Use of rates, ranges, etc. Randomization of points, offsets Need to establish guidance for users and recipients Data sharing agreements

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27 Useful Resources GIS in Public Health Public Health GIS News and Information Federal Geographic Data Committee National Spatial Data Infrastructure Geocoding 101 Software applications Tele Atlas

28 Division of HIV/STD Acknowledgements Kyle Bernstein Joshua Michaud Baltimore City Health Department Michael Samuel California Department of Health Services Susan Lau Chris Delcher Virginia Department of Health Mark Stenger Washington State Department of Health

29 Division of HIV/STD Jeff Stover Director of Statistics & Data Management Phone:

30 Division of HIV/STD


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