Annex Table 2.

Classification of study type

Source: Own table

		Random sample of the general population	Random sample from an access panel	Adaptation and design weighting	Non-Probability Sample	Trend Design	Cohort Design	Identical assessment of the outcome over several measurement points
Study type I: PRIMARY DATA
A	Representative cross-sectional study with random sample from the general population and possibility of comparison with identically surveyed cross-sectional study in trend	X		X		X	In part	X
B	Representative cross-sectional study with random sample from an ACCESS-Panel and possibility of comparison with identically surveyed cross-sectional study in trend		X	X		X	In part	X
C	Representative cross-sectional study with random sample and one-time survey	X
D	Cohort study with random sample at t1	X					X	X
E	Cohort study with non-probability sample at t1				X		X	X
F	Cohort study with non-probability sample				X			In part
Study type II: ROUTINE DATA