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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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Accessible zones of 1.5 km of each clinic after eliminating uninhabitable areas.
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Figure 4: Accessible zones of 1.5 km of each clinic after eliminating uninhabitable areas.

Mentions: Regarding the assumption of maximum walking time of 30 minutes, a buffer of 1.5 Kilometre Euclidean distance was defined as accessible zone for each clinic, assuming that addicts will cover this distance in 30 minutes. (Figure 4)


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)

Accessible zones of 1.5 km of each clinic after eliminating uninhabitable areas.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: Accessible zones of 1.5 km of each clinic after eliminating uninhabitable areas.
Mentions: Regarding the assumption of maximum walking time of 30 minutes, a buffer of 1.5 Kilometre Euclidean distance was defined as accessible zone for each clinic, assuming that addicts will cover this distance in 30 minutes. (Figure 4)

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