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Measuring the geographic coverage of methadone maintenance programme in Hong Kong by using geographic information system (GIS).

Pang TT, Lee SS - Int J Health Geogr (2008)

Bottom Line: While access and utilization form core components in assessing the effectiveness of a health service, the concept of coverage is often neglected.One district having no clinic results in 0% coverage whereas another without a clinic yields 15.3% coverage from the clinic in adjacent district.Geographic coverage could become an important consideration for monitoring harm reduction.

View Article: PubMed Central - HTML - PubMed

Affiliation: Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Shatin, Hong Kong, China. ppang@cuhk.edu.hk

ABSTRACT

Objective: While access and utilization form core components in assessing the effectiveness of a health service, the concept of coverage is often neglected. In this study we propose to develop a GIS-based methodological framework for the measurement of district-based geographic coverage to examine the service effectiveness of methadone treatment programme (MTP) in Hong Kong on a regular basis.

Methods: To overcome the incompatibility of spatial units, population data and data of heroin addiction of the year 2001 are interpolated by population-weighted and area-weighted algorithms. Standard overlay and proximity analytical functions are used to delineate altogether 20 accessible zones around each methadone clinic at a fixed 1.5 km Euclidean distance. Geographic coverage here is defined as the percentage of heroin addicts covered by a methadone clinic within the accessible zone by district.

Results: A total of 6413 out of 11000 reported heroin addicts are found geographically covered. The average geographic coverage in Hong Kong is 44.6%, with the figure varying from 0% to 96% by district. One district having no clinic results in 0% coverage whereas another without a clinic yields 15.3% coverage from the clinic in adjacent district. Maps illustrating district-based geographic coverage are generated.

Conclusion: As continuous data collection is required for a monitoring system, the simplified approach facilitates the handling of large volume data and relevant data analysis. It is concluded that the number of methadone clinics is as important as their locations. Geographic coverage could become an important consideration for monitoring harm reduction.

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Related in: MedlinePlus

A map showing (A) Whole territory of Hong Kong; (B) Inhabitable areas after elimination of highland and water bodies indicated as hollow areas.
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Figure 2: A map showing (A) Whole territory of Hong Kong; (B) Inhabitable areas after elimination of highland and water bodies indicated as hollow areas.

Mentions: In preparing the Hong Kong base maps for spatial analysis, all water bodies, including reservoir and rivers, and land elevated over 200 metres were eliminated. (Figure 2) As there was slight difference between the outline boundary of district and TPU, district base map was used as a reference to adjust TPU boundary. Population data were joined to the attribute tables of the base maps of district and TPU. As a result, a TPU-based boundary map of inhabitable area connected with population data was generated.


Measuring the geographic coverage of methadone maintenance programme in Hong Kong by using geographic information system (GIS).

Pang TT, Lee SS - Int J Health Geogr (2008)

A map showing (A) Whole territory of Hong Kong; (B) Inhabitable areas after elimination of highland and water bodies indicated as hollow areas.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2268919&req=5

Figure 2: A map showing (A) Whole territory of Hong Kong; (B) Inhabitable areas after elimination of highland and water bodies indicated as hollow areas.
Mentions: In preparing the Hong Kong base maps for spatial analysis, all water bodies, including reservoir and rivers, and land elevated over 200 metres were eliminated. (Figure 2) As there was slight difference between the outline boundary of district and TPU, district base map was used as a reference to adjust TPU boundary. Population data were joined to the attribute tables of the base maps of district and TPU. As a result, a TPU-based boundary map of inhabitable area connected with population data was generated.

Bottom Line: While access and utilization form core components in assessing the effectiveness of a health service, the concept of coverage is often neglected.One district having no clinic results in 0% coverage whereas another without a clinic yields 15.3% coverage from the clinic in adjacent district.Geographic coverage could become an important consideration for monitoring harm reduction.

View Article: PubMed Central - HTML - PubMed

Affiliation: Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Shatin, Hong Kong, China. ppang@cuhk.edu.hk

ABSTRACT

Objective: While access and utilization form core components in assessing the effectiveness of a health service, the concept of coverage is often neglected. In this study we propose to develop a GIS-based methodological framework for the measurement of district-based geographic coverage to examine the service effectiveness of methadone treatment programme (MTP) in Hong Kong on a regular basis.

Methods: To overcome the incompatibility of spatial units, population data and data of heroin addiction of the year 2001 are interpolated by population-weighted and area-weighted algorithms. Standard overlay and proximity analytical functions are used to delineate altogether 20 accessible zones around each methadone clinic at a fixed 1.5 km Euclidean distance. Geographic coverage here is defined as the percentage of heroin addicts covered by a methadone clinic within the accessible zone by district.

Results: A total of 6413 out of 11000 reported heroin addicts are found geographically covered. The average geographic coverage in Hong Kong is 44.6%, with the figure varying from 0% to 96% by district. One district having no clinic results in 0% coverage whereas another without a clinic yields 15.3% coverage from the clinic in adjacent district. Maps illustrating district-based geographic coverage are generated.

Conclusion: As continuous data collection is required for a monitoring system, the simplified approach facilitates the handling of large volume data and relevant data analysis. It is concluded that the number of methadone clinics is as important as their locations. Geographic coverage could become an important consideration for monitoring harm reduction.

Show MeSH
Related in: MedlinePlus