condition mean min max ZT0-3 605.706442 605.706442 605.706442 ZT4-7 678.033518 678.033518 678.033518 ZT8-11 834.1996065000001 834.1996065000001 834.1996065000001 ZT12-15 1162.152322 1162.152322 1162.152322 ZT16-19 1299.090879 1299.090879 1299.090879 ZT20-23 1741.435078 1741.435078 1741.435078