Reconstructing the 2003/2004 H3N2 influenza epidemic in Switzerland with a spatially explicit, individual-based model

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).