Multivariable regression showed that odds of being a severe / critically ill case were associated with age ( year ) ( OR ( Continued on next page ) 1 . 06 , 95 % CI 1 . 03 - 1 . 09 ) , lymphocyte count ( 10 9 / L ) ( OR 0 . 25 , 95 % CI 0 . 08 - 0 . 74 ) , and pulmonary opacity in CT