Hospital mortality was significantly lower with 28 deaths among 98 patients ( 28.6 % [ 95 % CI , 19.9 % -38.6 % ] ) for vitamin D3 compared with 47 deaths among 102 patients ( 46.1 % [ 95 % CI , 36.2 % -56.2 % ] ) for placebo ( HR , 0.56 [ 95 % CI , 0.35-0 .90 ] , P for interaction = .04 ) , but not 6-month mortality ( 34.7 % [ 95 % CI , 25.4 % -45.0 % ] for vitamin D3 vs 50.0 % [ 95 % CI , 39.9 % -60.1 % ] for placebo ; HR , 0.60 [ 95 % CI , 0.39-0 .93 ] , P for interaction = .12 ) .