CPAP reduced ESS by 21 points ( 95 % CI -30 to -13 ; p < 00001 ) at 3 months for 124 ( 89 % ) of 140 patients compared with 124 ( 90 % ) of 138 patients given BSC , and by 20 points ( -28 to -12 ; p < 00001 ) at 12 months for 116 patients compared with 122 patients given BSC .