Comparison of the clinical characteristics of GII.4 Sydney with other NoV-positive outpatients in Beijing, China.

NOTE. Values are median (IQR) or n (%) of patients unless otherwise stated. aThe information for this group was obtained from NoV-positive outpatients in our previous study between October 2007 and September 2008. bThe information from other NoV-positive case group was missing. cOne participant in GII.4 Sydney case group was missing information on symptoms.