condition mean min max ZT0-3 1.1663744999999999 0.965754 1.366995 ZT4-7 6.40642 6.40642 6.40642 ZT8-11 3.621305 3.621305 3.621305 ZT12-15 0 0 0 ZT16-19 3.36212 3.36212 3.36212 ZT20-23 4.530335 4.530335 4.530335