condition mean min max ZT0-3 488.75 488.75 488.75 ZT4-7 535.6 535.6 535.6 ZT8-11 546.55 546.55 546.55 ZT12-15 466.95000000000005 466.95000000000005 466.95000000000005 ZT16-19 458.5 458.5 458.5 ZT20-23 434.1 434.1 434.1