condition mean min max ZT0-3 2.6830974999999997 1.697285 3.66891 ZT4-7 2.604495 2.604495 2.604495 ZT8-11 1.94007 1.94007 1.94007 ZT12-15 0 0 0 ZT16-19 1.670628 1.670628 1.670628 ZT20-23 2.01435 2.01435 2.01435