Table 1. List of the most important factors associated with soil-transmitted helminth infections grouped into categories.

Socioeconomic characteristics (SEC)	Environmental characteristics (EC)	Soil characteristics (SC)
• F1 = % Population with sanitation at home • F2 = %Urban population • F3 = % Population with access to safe drinking water • F4 = % Population with computer • F5 = % Population with overcrowding • F6 = Unemployment rate	• F1 = Normalized Difference Vegetation Index (NDVI) • F2 = Maximum temperature • F3 = Minimum temperature • F4 = Altitude • F5 = Precipitation driest month • F6 = Annual precipitation • F7 = Land Cover type • F8 = Precipitation wettest month • F9 = Mean annual temperature	• F1 = Soil acidity • F2 = Bulk density • F3 = Organic carbon content • F4 = Gypsum content