condition mean min max ZT0-3 8.512805 8.34036 8.68525 ZT4-7 4.34126 4.34126 4.34126 ZT8-11 5.686325 5.686325 5.686325 ZT12-15 0 0 0 ZT16-19 10.17207 10.17207 10.17207 ZT20-23 8.718875 8.718875 8.718875