condition mean min max ZT0-3 602.35 602.35 602.35 ZT4-7 728.5 728.5 728.5 ZT8-11 424.7 424.7 424.7 ZT12-15 335.1 335.1 335.1 ZT16-19 423.04999999999995 423.04999999999995 423.04999999999995 ZT20-23 509.59999999999997 509.59999999999997 509.59999999999997