condition mean min max ZT0-3 0.424224 0.424224 0.424224 ZT4-7 0.2604165 0.2604165 0.2604165 ZT8-11 0.8599495 0.8599495 0.8599495 ZT12-15 1.088632 1.088632 1.088632 ZT16-19 2.3405050000000003 2.3405050000000003 2.3405050000000003 ZT20-23 1.0358885 1.0358885 1.0358885