Overall mean power output was possibly higher in ICE ( +1.4 % 1.8 % [ 90 % confidence limit ] ; 0.4 > smallest worthwhile change [ SWC ] ) and likely higher PC+ICE ( +2.5 % 1.9 % ; 1.5 > SWC ) than in CON ; however , no substantial differences were shown between PC+ICE and ICE ( unclear ) .