condition mean min max ZT0-3 8.28194 6.143155 9.483875000000001 ZT4-7 2.818735 2.818735 2.818735 ZT8-11 2.9062349999999997 2.9062349999999997 2.9062349999999997 ZT12-15 4.35685 3.39689 5.31681 ZT16-19 6.68552 6.68552 6.68552 ZT20-23 13.015450000000001 13.015450000000001 13.015450000000001