condition mean min max ZT0-3 0.8371733333333333 0.44809699999999997 1.5211999999999999 ZT4-7 0.6291439999999999 0.6291439999999999 0.6291439999999999 ZT8-11 0.497712 0.497712 0.497712 ZT12-15 0.65237125 0.5728344999999999 0.731908 ZT16-19 0.5192684999999999 0.5192684999999999 0.5192684999999999 ZT20-23 0.700217 0.700217 0.700217