Table 2.

Data used to compute limits and reference values for the narcolepsy risk following Pandemrix vaccination

Country	Age group	$$N_{\mathit{\text{xy}}}^R$$ *	$$N_x^R$$	$$N_x^E$$	Reference risk
Finland	4-19 years	1	177	688,566	46 cases in 688,566 vaccinees
Sweden	0-20 years	6‡	834	1.6 million†	126 cases in 1.0 million† vaccinees

*Reports with MedDRA preferred term ’Narcolepsy’.

^‡ This excludes two cases reported before 15^th August 2010 but initially misdiagnosed.

^‡ This is an estimate based on 69.5% vaccination coverage [14].

The reference risk values for Finland and Sweden were computed from the studies by Nohynek et al. [12] and Persson et al. [14], respectively.