condition mean min max ZT0-3 0.4188439666666667 0.1404509 0.801724 ZT4-7 0.6437205 0.6437205 0.6437205 ZT8-11 0.7135155 0.7135155 0.7135155 ZT12-15 1.720055 1.3547 2.08541 ZT16-19 1.56017 1.56017 1.56017 ZT20-23 0.8583544999999999 0.8583544999999999 0.8583544999999999