condition mean min max ZT0-3 13.644 13.00995 14.27805 ZT4-7 7.41067 7.41067 7.41067 ZT8-11 8.239815 8.239815 8.239815 ZT12-15 0 0 0 ZT16-19 13.83375 13.83375 13.83375 ZT20-23 12.5191 12.5191 12.5191