The mean ( SD ) PWT at @ months increased in the GM-CSF group from @ ( @ ) seconds to @ ( @ ) seconds ( mean change , @ seconds -LSB- @ % CI , @ to @ -RSB- ) and in the placebo group from @ ( @ ) seconds to @ ( @ ) seconds ( change of @ seconds -LSB- @ % CI , @ to @ -RSB- ) , but this difference was not significant ( mean difference in change in PWT , @ seconds -LSB- @ % CI , -@ to @ -RSB- , P = @ ) .