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

Table 4 Contact data

Age group	Empirical mean [44]¹	Mean household contacts in CH²	Mean activities per person³	Mean contacts per activity [SD]⁴	Median contacts per activity [IQR]⁴
0-4	10.21	2.95	1.29	5.62 [4.0]	5 [3-8]
5-9	14.81	3.23	1.52	7.6 [5.2]	7 [4-10]
10-14	18.22	3.23	1.54	9.75 [6.4]	9 [5-13]
15-19	17.58	2.98	2.29	6.38 [4.5]	6 [3-9]
20-29	13.57	2.12	2.06	5.56 [4.0]	5 [3-8]
30-39	14.14	2.40	1.91	6.14 [4.3]	5 [3-8]
40-49	13.83	2.52	1.90	5.95 [4.2]	5 [3-8]
50-59	12.30	1.63	1.87	5.70 [4.1]	5 [3-8]
60-69	9.21	1.32	1.72	4.58 [3.4]	4 [2-6]
70+	6.89	1.39	1.82	3.02 [2.5]	3 [1-4]

¹Average number of contact partners per day as measured by Mossong et al.
²Average number of contact partners within the individuals' household. Calculations are based on the Swiss census (Volkszählung 2000) and we assume that all individuals living in one household interact in a potentially contagious manner on a daily base.
³Average number of distinct activities performed by one individual per day.
⁴We assume that the number of contacts per activity follows a negative binomial distribution. The two columns describe the distributions that were determined to achieve a plausible overall contact distribution (see the "Realizing contacts" section).

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