Table 3. Defined scenarios with distinct parameter choices used in simulation runs.

			Parameters
			Beta-binomial distribution			Proportion accepts invitation	Mixing by sex, proportion		Mixing by age groups, proportion						Mixing by education level, proportion
Scenarios		Seeds	c	μ	σ2	p	F-F	M-M	a1-a1	a1-a2	a2-a1	a2-a2	a3-a1	a3-a2	A-A	B-B
Randomly draw 9000 combinations of μ and σ2	S1	1	4	[0.1–3.9]	[0.1–3.9]	1	Successful sending was not dependent on characteristics recruiter, thus no influence of mixing behaviour on number of recruitees in recruitment trees.
μ and p depend on recruiter’s characteristics	S2	1015 from data	4	See S1 Table	See S1 Table	See S1 Table	0.66	0.42	0.60	0.18	0.26	0.56	0.19	0.26	0.65	0.66
μ and p depend on recruiter’s characteristics + whether seed or recruitee	S3	1015 from data	4	See S2 Table	See S2 Table	See S2 Table	0.66	0.42	0.66	0.18	0.26	0.56	0.19	0.26	0.65	0.66
μ and p depend on recruiter’s characteristics + whether seed or recruitee, assuming heterogeneity mixing behaviour over waves	S4	1015 from data	4	See S2 Table	See S2 Table	See S2 Table	Assumed heterogeneity in mixing behaviour for different waves, as observed in the data. Values taken from Table 2.
Assuming a beta-binomial distribution with highest possible σ2 (as observed in data)	S5	1	4	0.1, 0.2,…, 3.9	0.1–3.4*	0.19	Successful sending was not dependent on characteristics recruiter, thus no influence of mixing behaviour on number of recruitees and wave reached in recruitment trees.
	S6	1	4	0.1, 0.2,…, 3.9	0.1–3.4*	0.40
	S7	1	4	0.1, 0.2,…, 3.9	0.1–3.4*	0.60
	S8	1	4	0.1, 0.2,…, 3.9	0.1–3.4*	0.80
	S9	1	4	0.1, 0.2,…, 3.9	0.1–3.4*	1
Assuming a beta-binomial distribution with lowest possible σ2	S10	1	4	0.1, 0.2,…, 3.9	0.1–1.1Є	0.19
	S11	1	4	0.1, 0.2,…, 3.9	0.1–1.1Є	0.40
	S12	1	4	0.1, 0.2,…, 3.9	0.1–1.1Є	0.60
	S13	1	4	0.1, 0.2,…, 3.9	0.1–1.1Є	0.80
	S14	1	4	0.1, 0.2,…, 3.9	0.1–1.1Є	1
Differences in mixing behaviour	S15	100 random seeds from data	4	See S3 Table (+0.6)	see S3 Table (-0.6)	1	Assumed heterogeneity in mixing behaviour for different waves, as observed in the data. Values taken from Table 2.
	S16	100 random seeds from data	4	see S3 Table (+0.6)	see S3 Table (-0.6)	1	0.50	0.50	0.33	0.33	0.33	0.33	0.33	0.33	0.50	0.50
	S17	100 random seeds from data	4	see S3 Table (+0.6)	see S3 Table (-0.6)	1	1	0.50	0.33	0.33	0.33	0.33	0.33	0.33	0.50	1
Active seeds	S18	100 highly active seeds	4	see S3 Table (+0.6)	see S3 Table (-0.6)	1	1	0.50	0.33	0.33	0.33	0.33	0.33	0.33	0.50	1

*High σ² chosen, similar to observed in data. See S2A Fig for the different shapes of the beta-binomial distribution.

^ЄLowest possible σ² with respect to chosen μ. See S2B Fig for the different shapes of the beta-binomial distribution.