condition mean min max ZT0-3 0.6862050000000001 0.5992515 0.738253 ZT4-7 0.2872865 0.2872865 0.2872865 ZT8-11 0.39382150000000005 0.39382150000000005 0.39382150000000005 ZT12-15 1.019362 0.852259 1.186465 ZT16-19 0.5466985 0.5466985 0.5466985 ZT20-23 0.6770605 0.6770605 0.6770605