condition mean min max ZT0-3 40.298066666666664 27.39565 48.357749999999996 ZT4-7 21.3456 21.3456 21.3456 ZT8-11 18.9003 18.9003 18.9003 ZT12-15 32.928625000000004 32.209450000000004 33.647800000000004 ZT16-19 34.045249999999996 34.045249999999996 34.045249999999996 ZT20-23 56.68805 56.68805 56.68805