condition mean min max ZT0-3 437.5 437.5 437.5 ZT4-7 569.1 569.1 569.1 ZT8-11 504.70000000000005 504.70000000000005 504.70000000000005 ZT12-15 396.9 396.9 396.9 ZT16-19 491.85 491.85 491.85 ZT20-23 485.45 485.45 485.45