Predicted efficacy in the groups with intervals of 1 month ( n = 2701 , 133 events ) or 2 months ( n = 1351 , 58 events ) between doses against radiologic pneumonia were 33 % ( 95 % CI 20-44 % ) and 36 % ( 95 % CI 24-46 % ) , against hospitalisation 15 % ( 95 % CI 5-24 % ) and 18 % ( 95 % CI 8-27 % ) , and against mortality 17 % ( 95 % CI -2 to 33 % ) and 13 % ( 95 % CI -8 to 29 % ) respectively .