Table 1 Description of environmental variables used to model the global distribution of lymphatic filariasis transmission
From: The global distribution and transmission limits of lymphatic filariasis: past and present
Environmental variable | Description |
|---|---|
Mean minimum temperature | Mean of average monthly minimum temperature across all 12 months (period 1950-2000) |
Annual mean temperature | Mean of average monthly mean temperature across all 12 months (period 1950-2000) |
Precipitation in wettest quarter | Total precipitation in the wettest quarter |
Precipitation in driest quarter | Total precipitation in the driest quarter |
Annual precipitation | Mean of accumulative precipitation across all 12 months (period 1950-2000) |
Aridity Index | Indicator of the degree of dryness of the climate at a given location, and result from dividing the mean annual precipitation by the mean annual potential evapo-transpiration |
Elevation | Metres above the sea level obtained by radar imagery |
EVI | Mean of 8-day composite MODIS images for the period 2001 to 2005. EVI raw values (scale from 0 to 1) have been multiplied by 1,000 for being storage as integers. |
Global Land Cover 2006 | A simplified version of seven major land cover classes obtained from the UN Global Land Cover (22 classes) |
Population density (1995-2015) | Average population density 1995-2015 |
WHO regions | WHO regions: AFRO/EMRO (African and Eastern Mediterranean regions), AMRO (Americas region), SEARO (South-east Asia) and WPRO (western Pacific) |
Accessibility | Cost (in time units) to access to large urban areas |