OTTAWA, While the H1N1 global pandemic may not have resulted in as many severe cases as originally predicted, a new study released today by the Canadian Institute for Health Information (CIHI) shows that more than 15,000 Canadians were admitted to hospital for H1N1 in Canada between April and December 2009. This is about 6,500 more patients than the number of lab-confirmed hospitalization cases reported at the end of last year, as it includes the number of both confirmed and probable H1N1 acute care hospitalizations.