condition mean min max ZT0-3 3.6072550000000003 3.4965200000000003 3.7179900000000004 ZT4-7 3.307255 3.307255 3.307255 ZT8-11 2.68027 2.68027 2.68027 ZT12-15 0 0 0 ZT16-19 4.19388 4.19388 4.19388 ZT20-23 3.904335 3.904335 3.904335