condition mean min max ZT0-3 0.31424725 0.227407 0.4010875 ZT4-7 0.40637449999999997 0.40637449999999997 0.40637449999999997 ZT8-11 0.5162175 0.5162175 0.5162175 ZT12-15 0 0 0 ZT16-19 0.422848 0.422848 0.422848 ZT20-23 0.5658795 0.5658795 0.5658795