The percentage of participants with serious adverse events was @ % -LSB- @/@ -RSB- of the steroids group and @ % -LSB- @/@ -RSB- of the placebo group ( P > @ ) ; however , participants receiving steroids had an earlier time of onset of their first serious adverse event by @ days posthepatoportoenterostomy ( @ % -LSB- @ % CI , @ % to @ % -RSB- of steroids group vs @ % -LSB- @ % CI , @ % to @ % -RSB- of placebo group ; P = @ ) .