condition mean min max ZT0-3 229.4585 228.546 230.37099999999998 ZT4-7 276.121 276.121 276.121 ZT8-11 320.12800000000004 320.12800000000004 320.12800000000004 ZT12-15 0 0 0 ZT16-19 282.16499999999996 282.16499999999996 282.16499999999996 ZT20-23 299.797 299.797 299.797