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. 2018 May 15;13(5):e0197391. doi: 10.1371/journal.pone.0197391

Table 1. Variables used in correlation analysis.

Variable Unit
Deforestation
Remaining forest area 1. Remaining forest area in 1990 %
Forest-area change 2. Forest-area change during 1980–89 % yr-1
3. Forest-area change during 1990–99 % yr-1
4. Forest-area change during 2000–04 % yr-1
5. Forest-area change during 2005–09 % yr-1
Proximate causes 1. Per capita area required for wood & food production km2 person-1 yr-1
Wood extraction 2. Per capita area required for wood production km2 person-1 yr-1
Agricultural expansion 3. Per capita area required for food production km2 person-1 yr-1
4. Per capita area required for oil palm production km2 person-1 yr-1
5. Per capita area required for stimulants production km2 person-1 yr-1
6. Per capita area required for production of ten major crops km2 person-1 yr-1
Underlying causes
Population 1. Population density no. km-2
2. Total annual population growth % yr-1
3. Rural annual population growth % yr-1
4. Urban annual population growth % yr-1
5. Percentage of urban population %
Economy 6. PPP adjusted per capita GDP Current international dollar
7. Annual GDP growth % yr-1
8. Industry, value added (% of GDP) %
9. Headcount poverty ratio at $2/day (% of population) %
10. Forest rents (% of GDP) %
11. Total natural resources rents (% of GDP) %
12. Proportion of forest rents to total natural resources rents %
13. Human development index Unitless
Social condition 14. Corruption Unitless
15. Social openness (PCA 1 between the following two variables) Unitless
 Polity
 Freedom (political right and civil liberty)
Land-use efficiency 16. Agricultural input (PCA 1 between the following three variables) Unitless
 Agricultural machines import per unit agricultural area
 Pesticides import per unit agricultural area
 Fertilizers consumption per unit agricultural area
17. Cereal yield Mg ha-1
18. Agricultural yield (PCA 1 between yield values of six crops aggregated) Unitless
Wood & food trade 19. Self-sufficiency ratio in terms of wood products Unitless
20. Self-sufficiency ratio in terms of food Unitless
21. Self-sufficiency ratio in terms of wood and food Unitless
Environmental condition 22. Remaining forest area %
23. Median elevation m
24. Total land area km2
25. Climatic seasonality (PCA 1 between 12 soil variables) Unitless
26. Soil moisture and CEC (PCA 1 between 19 climate variables) Unitless
27. Lowland tropical forests as potential natural vegetation (% land area) %