condition mean min max ZT0-3 4.60855 4.17779 5.03931 ZT4-7 6.2717 6.2717 6.2717 ZT8-11 4.69162 4.69162 4.69162 ZT12-15 0 0 0 ZT16-19 4.28453 4.28453 4.28453 ZT20-23 4.644295 4.644295 4.644295