condition mean min max ZT0-3 394.2 394.2 394.2 ZT4-7 343.6 343.6 343.6 ZT8-11 330.45000000000005 330.45000000000005 330.45000000000005 ZT12-15 254.25 254.25 254.25 ZT16-19 317.45 317.45 317.45 ZT20-23 280.95 280.95 280.95