condition mean min max ZT0-3 0.801774 0.680796 0.922752 ZT4-7 1.6294395 1.6294395 1.6294395 ZT8-11 0.228129 0.228129 0.228129 ZT12-15 0 0 0 ZT16-19 0.9085445000000001 0.9085445000000001 0.9085445000000001 ZT20-23 1.593514 1.593514 1.593514