The median age of patients with H7N9 virus infection was older than other patient groups
After adjustment for age and sex , chronic heart disease was associated with an increased risk of hospitalization with H7N9
The median age of patients with H7N9 virus infection was older than other patient groups ( 63 years ; P < .001 ) and a higher proportion was male ( 71 % ; P < .02 ) .
After adjustment for age and sex , chronic heart disease was associated with an increased risk of hospitalization with H7N9 ( relative risk , 9.68 ; 95 % confidence interval , 5.24 - 17.9 ) .