RESULTS	After multivariable adjustment for baseline characteristics , WHF was associated with an increase in LOS of 4.33 days [ 95 % confidence interval ( CI ) 3.54-5 .13 days ] , a hazard ratio ( HR ) for 30-day HF readmission or death of 2.43 ( 95 % CI 1.75-3 .40 ) , and a HR for 90-day mortality of 2.57 ( 95 % CI 1.81-3 .65 ) , all with P < 0.0001 .\