condition mean min max ZT0-3 13.1767 11.75905 14.59435 ZT4-7 6.795014999999999 6.795014999999999 6.795014999999999 ZT8-11 6.044585 6.044585 6.044585 ZT12-15 0 0 0 ZT16-19 9.88581 9.88581 9.88581 ZT20-23 12.691949999999999 12.691949999999999 12.691949999999999