condition mean min max ZT0-3 0.7192956666666667 0.4066665 0.9866604999999999 ZT4-7 1.4569515 1.4569515 1.4569515 ZT8-11 0.72336 0.72336 0.72336 ZT12-15 3.2322625 2.016825 4.4477 ZT16-19 4.954385 4.954385 4.954385 ZT20-23 5.30275 5.30275 5.30275