condition mean min max ZT0-3 10.213741666666667 5.7806750000000005 13.342600000000001 ZT4-7 5.5821000000000005 5.5821000000000005 5.5821000000000005 ZT8-11 5.60212 5.60212 5.60212 ZT12-15 5.39715 4.127865 6.666435 ZT16-19 6.650915 6.650915 6.650915 ZT20-23 10.502825 10.502825 10.502825