condition mean min max ZT0-3 252.75 252.75 252.75 ZT4-7 347.1 347.1 347.1 ZT8-11 402.15 402.15 402.15 ZT12-15 509.04999999999995 509.04999999999995 509.04999999999995 ZT16-19 371.45 371.45 371.45 ZT20-23 225.55 225.55 225.55