condition mean min max ZT0-3 2.05512 1.912555 2.197685 ZT4-7 3.30363 3.30363 3.30363 ZT8-11 3.80671 3.80671 3.80671 ZT12-15 0 0 0 ZT16-19 1.85669 1.85669 1.85669 ZT20-23 2.46781 2.46781 2.46781