Table 3.

Groups of potential contact partners

Activity categories	Group definition
Home	All individuals living in one household.
Work	1) Grid cell group: all individuals working within a grid cell1.
	2) Work group: all individuals working within one grid cell1 are randomly assigned to work groups. The target group size distribution is a normal distribution with a mean of 10 (SD = 2).
Education	1) Grid cell group: all individuals performing an educational activity within a grid cell1.
	2) Class A: all individuals aged 18 or younger within one grid cell1 are assigned to classes. The target class size is 20 students and classes are stratified by age.
	3) Class B: all individuals older than 18 within one grid cell1 are randomly assigned to classes. The target class size is 20 students. There is no age stratification.
Shop	All individuals shopping within a grid cell1.
Leisure	All individuals performing leisure activities within a grid cell1 (not at home).

¹The physical space is divided into grid cells of 500 by 500 meters.