condition mean min max ZT0-3 37.556718315 24.08812894 51.02530769 ZT4-7 26.257762167499997 24.854994195 27.66053014 ZT8-11 24.473368094999998 23.936986715 25.009749475 ZT12-15 21.5803481525 21.323661870000002 21.837034435 ZT16-19 34.2819161425 28.5581612 40.005671085 ZT20-23 49.30430164 48.410675495 50.197927785