condition mean min max ZT0-3 6.08461 6.08461 6.08461 ZT4-7 3.313725 3.313725 3.313725 ZT8-11 2.99066 2.99066 2.99066 ZT12-15 6.38143 6.38143 6.38143 ZT16-19 5.827030000000001 5.827030000000001 5.827030000000001 ZT20-23 7.19144 7.19144 7.19144