Table 4 Additional variables captured for critical appraisal

1.

Does the information presented set the study’s historical context?

2.

Does the information presented set the study’s ecological context?

3.

Is there information on the political context for the duration of the study?

Site and population information

4.

Does study provide information on site characteristics at the time of the study?

• Soil

• Climate

• Is account taken of seasonality?

• Is site vegetation documented?