Idebenone significantly attenuated the fall in PEF % p from baseline to week @ in the mITT ( -@ % p -LSB- @ % CI -@ to @ -RSB- , p = @ , vs placebo -@ % p -LSB- -@ to -@ -RSB- , p = @ ; difference @ % p -LSB- @ to @ -RSB- , p = @ ) and ITT populations ( -@ % p -LSB- -@ to @ -RSB- , p = @ , vs -@ % p -LSB- -@ to -@ -RSB- , p < @ ; difference @ % p -LSB- @ to @ -RSB- , p = @ ) .