No patients had a modified Rankin scale score of @ to @ ( survival with no disability or slight disability ) ; @ % of patients in the surgery group and @ % of patients in the control group had a score of @ ( moderate disability ) ; @ % and @ % , respectively , had a score of @ ( moderately severe disability -LSB- requirement for assistance with most bodily needs -RSB- ) ; and @ % and @ % , respectively , had a score of @ ( severe disability ) .