All devices reduced AHI compared with no treatment by 26 % ( 95 % CI 11 % to 38 % , p = 0.001 ) for SP1 , 33 % ( 95 % CI 24 % to 41 % ) for SP2 and 36 % ( 95 % CI 24 % to 45 % , p < 0.001 ) for bMAD .