Table 3.

Parameter estimations obtained for the three predominant influenza (sub)types A/H1N1. A/H3N2 and B in seasons where the calculations where possible

Parameters	Description	A/H1N1	A/H3N2			B
		2000–2001	2002–2003	2003–2004	2008–2009	2001–2002	2007–2008
θC	Children transmissibility	0·375 (0·374–0·501)	0·339 (0·329–0·356)	0·275 (0·268–0·332)	0·334 (0·323–1·804)	0·352 (0·344–1·536)	0·314 (0·309–0·442)
θAE	Adults and elderly transmissibility	0·179 (0·164–0·194)	0·429 (0·379–0·487)	0·600 (0·481–0·750)	0·198 (0·174–0·218)	0·214 (0·192–0·254)	0·207 (0·187–0·232)
ρ	Reporting rate	19·7% (18·6–26·2)	24·1% (21·9–26·3)	33·4% (28·3–40·1)	22·4% (19·1–98·2)	26·5% (25·2–99·3)	20·1% (18·2–27·5)
S0 C	Fraction of susceptible children at the start of the epidemic	1·0 (0·752–1·0)	1·0 (0·944–1·0)	1·0 (0·838–1·0)	1·0 (0·256–1·0)	1·0 (0·256–1·0)	1·0 (0·713–1·0)
S0 A	Fraction of susceptible adults at the start of the epidemic	0·775 (0·730–0·819)	0·446 (0·400–0·493)	0·304 (0·245–0·372)	0·821 (0·765–0·837)	0·703 (0·554–0·775)	0·771 (0·697–0·842)
S0 E	Fraction of susceptible elderly at the start of the epidemic	0·275 (0·207–0·352)	0·349 (0·288–0·411)	0·203 (0·153–0·262)	0·469 (0·359–0·583)	0·342 (0·230–0·450)	0·375 (0·265–0·486)
S∞ C	Fraction of susceptible children at the end of the epidemic	0·465	0·485	0·758	0·522	0·504	0·609
S∞ A	Fraction of susceptible adults at the end of the epidemic	0·668	0·274	0·218	0·676	0·584	0·655
S∞ E	Fraction of susceptible elderly at the end of the epidemic	0·251	0·257	0·166	0·416	0·304	0·340
Re	Effective reproductive ratio	1·36	1·35	1·17	1·28	1·31	1·21
μ	Average number of cases because of other respiratory infections	0·71 × 10−3 (0·58–0·84)	0·91 × 10−3 (0·68–1·15)	0·36 × 10−3 (0·19–0·51)	0·86 × 10−3 (0·53–1·06)	0·74 × 10−3 (0·50–0·96)	0·31 × 10−3 (0·15–0·47)
R 2 C	Children	0·99	0·98	0·95	0·94	0·97	0·98
R 2 A	Adults	0·90	0·94	0·97	0·82	0·91	0·75
R 2 E	Elderly	0·26	0·89	0·88	0·72	0·78	0·73
R 2 tot	Total	0·97	0·97	0·98	0·92	0·97	0·91

Numbers in parenthesis represent 95% confidence intervals.