After multivariable adjustment for baseline characteristics , WHF was associated with an increase in LOS of @ days -LSB- @ % confidence interval ( CI ) @-@ @ days -RSB- , a hazard ratio ( HR ) for @-day HF readmission or death of @ ( @ % CI @-@ @ ) , and a HR for @-day mortality of @ ( @ % CI @-@ @ ) , all with P < @ .